Note 8 - Commitments and Contingencies	9 Months Ended
Dec. 31, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	8. Commitments and Contingencies: We have been identified by the United States Environmental Protection Agency (“EPA”), state governmental agencies or other private parties as a potentially responsible party (“PRP”) under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), or equivalent non-U.S., state or local laws, for clean-up and response costs associated with certain sites at which remediation is required with respect to prior contamination. Because CERCLA or such state statutes authorize joint and several liability, the EPA or non-U.S., state or local regulatory authorities could seek to recover all clean-up costs from any one of the PRPs at a site despite the involvement of other PRPs. At certain sites, financially responsible PRPs other than AVX also are, or have been, involved in site investigation and clean-up activities. We believe that liability resulting from these sites will be apportioned between AVX and other PRPs. To resolve our liability at the sites at which we have been named a PRP, we have entered into various administrative orders and consent decrees with federal and state regulatory agencies governing the timing and nature of investigation and remediation. As is customary, the orders and decrees regarding sites where the PRPs are not themselves implementing the chosen remedy contain provisions allowing the EPA to reopen the agreement and seek additional amounts from settling PRPs in the event that certain contingencies occur, such as the discovery of significant new information about site conditions. On June 3, 2010, AVX entered into an agreement with the EPA and the City of New Bedford, pursuant to which AVX is required to perform environmental remediation at a site referred to as the “Aerovox Site” (the “Site”), located in New Bedford, Massachusetts. AVX has substantially completed its obligations pursuant to such agreement with the EPA and the City of New Bedford with respect to the satisfaction of AVX’s federal law requirements. The Massachusetts Department of Environmental Protection has jurisdiction over the balance of the environmental remediation at the Site although the EPA may have jurisdiction over some aspects of the overall remediation. AVX has submitted its proposed remedy, but until the state has approved such proposal, AVX cannot determine if additional groundwater and soil remediation will be required, if substantial material will have to be disposed of offsite, or if additional remediation techniques will be required, any of which could result in a more extensive and costly plan of remediation. Further, the Site and the remediation may be subject to additional scrutiny under other statutory procedures which could also add to the cost of remediation. During the year ended March 31, 2019 we increased our estimated accrual for work to be done at the Site by $8,312 pursuant to discussions with the Massachusetts Department of Environmental Protection and our environmental engineers. We have a remaining accrual of $18,569 at December 31, 2019, representing our current estimate of the potential liability related to the remaining performance of environmental remediation actions at the Site and neighboring properties using certain assumptions regarding the plan of remediation. Until all parties agree and remediation is complete, we cannot be certain there will be no additional cost relating to the Site. We had total reserves of approximately $26,371 and $22,482 at March 31, 2019 and December 31, 2019, respectively, related to various environmental matters and sites, including those discussed above. These reserves are classified in the Consolidated Balance Sheets as $5,749 and $2,660 in accrued expenses at March 31, 2019 and December 31, 2019, respectively, and $20,622 and $19,822 in other non-current liabilities at March 31, 2019 and December 31, 2019, respectively. The amounts recorded for identified environmental liabilities are based on estimates. Periodically, we review amounts recorded and adjust them to reflect additional legal and technical information that becomes available. Uncertainties about the status of laws, regulations, regulatory actions, technology, and information related to individual sites make it difficult to develop an estimate of the reasonably possible aggregate environmental remediation exposure. Accordingly, these costs could differ significantly from our current estimates. On April 19, 2016, the Canadian Ministry of the Environment and Climate Change (the “MoE”) issued a Director’s Order naming AVX Corporation, and others, as responsible parties with respect to a location in Hamilton, Ontario that was at one time the site of operations of Aerovox Canada, a former subsidiary of Aerovox Corporation, a predecessor of AVX. AVX has taken the position that any liability of Aerovox Canada for such site under the laws of Canada cannot be imposed on AVX. At present, it is unclear whether the MoE will seek to enforce such Canadian order against AVX, and whether, in the event it does so, AVX will have any liability under applicable law. AVX intends to contest any such course of action that may be taken by the MoE. In connection with the same location, Union Gas Limited and Coca-Cola Refreshments Canada Company filed suits in the Superior Court of Justice for Ontario, Canada, against AVX Corporation, Aerovox Corp. and Cooper Industries, LLC seeking to recover the costs of remediation of the site and for damages associated with alleged contamination of the site. Those suits were filed on April 18, 2018, but not served on AVX until October 11, 2018, and are in their initial stages. AVX is considering its legal options but intends to vigorously defend these matters. We also operate, or did at one time, on other sites that may have potential future environmental issues as a result of activities at sites during AVX’s long history of manufacturing operations or prior to the start of operations by AVX. Even though we may have rights of indemnity for such environmental matters at certain sites, regulatory agencies in those jurisdictions may require us to address such issues. Once it becomes probable that we will incur costs in connection with remediation of a site and such costs can be reasonably estimated, we establish reserves or adjust our reserves for our projected share of these costs. A separate account receivable is recorded for any indemnified costs. Our environmental reserves are not discounted and do not reflect any possible future insurance recoveries, which are not expected to be significant, but do reflect a reasonable estimate of cost sharing at multiple party sites or indemnification of our liability by a third party. We are not involved in any pending or threatened environmental proceedings that would require curtailment of our operations. We continually expend funds to ensure that our facilities comply with applicable environmental regulations. While we believe that we are in compliance with applicable environmental laws, we cannot accurately predict future developments and do not necessarily have knowledge of all past occurrences on sites that we currently occupy. New environmental regulations may be enacted and we cannot determine the modifications, if any, in our operations that any such future regulations might require, or the cost of compliance with such regulations. Moreover, the risk of environmental liability and remediation costs is inherent in the nature of our business and, therefore, there can be no assurance that material environmental costs, including remediation costs, will not arise in the future. On April 25, 2013, AVX was named as a defendant in a patent infringement case filed in the United States District Court for the District of Delaware captioned Greatbatch, Inc. v. AVX Corporation. This case alleged that certain AVX products infringe on one or more of six Greatbatch patents. On January 26, 2016, the jury returned a verdict in favor of the plaintiff in the first phase of a segmented trial and a mixed verdict in the second phase of a segmented trial, and found damages to Greatbatch in the amount of $37,500, which was recorded in fiscal 2016. That verdict was later vacated by the court on March 30, 2018. In fiscal 2018, we recorded a favorable accrual adjustment of $1,500 related to this patent infringement case. In a new trial, the amount of damages (excluding interest) was determined by a jury to be $22,100 on January 15, 2019 resulting in a favorable accrual adjustment of $13,900 for the year ended March 31, 2019. During the year ended March 31, 2019 the Company made a payment of $22,100 to an escrow account which is classified within “Other assets”. Additionally, during the nine months ended December 31, 2019, the Company made a payment of $5,646, representing pre-judgement interest, to an escrow account which is classified within "Other assets". The matter is now on appeal, the outcome of which could result in a material impact to the accrual for this case in the future. On September 2, 2014, a subsidiary of AVX, American Technical Ceramics (“ATC”), was named as a defendant in a patent infringement case filed in the United States District Court of the Southern District of California captioned Presidio Components, Inc. v. American Technical Ceramics Corp. This case alleged that certain ATC products infringe on a Presidio patent. On April 18, 2016, the jury returned a verdict in favor of the plaintiff and found damages to Presidio. On August 17, 2016, the court issued a permanent injunction prohibiting ATC from manufacturing or selling the related products after November 16, 2016. Subsequently, on October 21, 2016, the Federal Circuit Court granted AVX’s request for a stay of the permanent injunction whereby ATC was allowed to continue to sell the disputed product until March 17, 2017 to anyone who was a customer prior to June 17, 2016. Any sales subsequent to November 16, 2016 pursuant to the stay of the permanent injunction were subject to court mandated intellectual property damages for each product sold. In December 2017, a panel of the Federal Circuit vacated the damage award to Presidio, vacated the injunction, and remanded the case for further proceedings to determine damages limited to “reasonable royalties” and to reconsider the requested injunction in light of its opinion and any additional facts. In June 2018, the District Court set the amount of royalties and re-issued the injunction. The appeals from the royalties and the injunction were denied by the Federal Circuit Court in November 2019. Accordingly, the Company recorded a reduction of the accrual of $11,664 during the three and nine months ended December 31, 2019. The remaining accrual balance as of December 31, 2019 was $25,919. As of December 31, 2019, we had total reserves of $48,019 plus accrued interest in accrued expenses with respect to the two intellectual property cases discussed above. The amounts recorded are based on estimated outcomes. Amounts recorded are reviewed periodically and adjusted to reflect additional information that becomes available. Accordingly, these costs could differ significantly from our current estimates. During calendar year 2014, AVX was named as a co-defendant in a series of cases filed in the United States and in the Canadian provinces of Quebec, Ontario, British Columbia, Saskatchewan and Manitoba alleging violations of United States, state and Canadian antitrust laws asserting that AVX and numerous other companies were participants in alleged price-fixing in the capacitor market. The cases in the United States were consolidated into the Northern District of California on October 2, 2014. Some plaintiffs have broken off from the United States class action and filed actions on their own, although AVX is not named in all of these independent actions. The cases in Canada have not been consolidated. These cases are still in progress. AVX believes it has meritorious defenses and intends to vigorously defend the cases. The class action case is currently scheduled for trial in the Spring or Summer of 2020. We are involved in other disputes, warranty, and legal proceedings arising in the normal course of business. While we cannot predict the outcome of these other disputes and proceedings, we believe, based upon a review with legal counsel, that none of these other disputes or proceedings will have a material impact on our financial position, results of operations, comprehensive income (loss), or cash flows. However, we cannot be certain of the eventual outcome in these or other matters that may arise and their potential impact on our financial position, results of operations, comprehensive income (loss), or cash flows.

Note 8 - Commitments and Contingencies

9 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Text Block]

8. Commitments and Contingencies:

We have been identified by the United States Environmental Protection Agency (“EPA”), state governmental agencies or other private parties as a potentially responsible party (“PRP”) under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), or equivalent non-U.S., state or local laws, for clean-up and response costs associated with certain sites at which remediation is required with respect to prior contamination. Because CERCLA or such state statutes authorize joint and several liability, the EPA or non-U.S., state or local regulatory authorities could seek to recover all clean-up costs from any one of the PRPs at a site despite the involvement of other PRPs. At certain sites, financially responsible PRPs other than AVX also are, or have been, involved in site investigation and clean-up activities. We believe that liability resulting from these sites will be apportioned between AVX and other PRPs.

To resolve our liability at the sites at which we have been named a PRP, we have entered into various administrative orders and consent decrees with federal and state regulatory agencies governing the timing and nature of investigation and remediation. As is customary, the orders and decrees regarding sites where the PRPs are not themselves implementing the chosen remedy contain provisions allowing the EPA to reopen the agreement and seek additional amounts from settling PRPs in the event that certain contingencies occur, such as the discovery of significant new information about site conditions.

On June 3, 2010, AVX entered into an agreement with the EPA and the City of New Bedford, pursuant to which AVX is required to perform environmental remediation at a site referred to as the “Aerovox Site” (the “Site”), located in New Bedford, Massachusetts. AVX has substantially completed its obligations pursuant to such agreement with the EPA and the City of New Bedford with respect to the satisfaction of AVX’s federal law requirements. The Massachusetts Department of Environmental Protection has jurisdiction over the balance of the environmental remediation at the Site although the EPA may have jurisdiction over some aspects of the overall remediation. AVX has submitted its proposed remedy, but until the state has approved such proposal, AVX cannot determine if additional groundwater and soil remediation will be required, if substantial material will have to be disposed of offsite, or if additional remediation techniques will be required, any of which could result in a more extensive and costly plan of remediation. Further, the Site and the remediation may be subject to additional scrutiny under other statutory procedures which could also add to the cost of remediation. During the year ended March 31, 2019 we increased our estimated accrual for work to be done at the Site by $8,312 pursuant to discussions with the Massachusetts Department of Environmental Protection and our environmental engineers. We have a remaining accrual of $18,569 at December 31, 2019, representing our current estimate of the potential liability related to the remaining performance of environmental remediation actions at the Site and neighboring properties using certain assumptions regarding the plan of remediation. Until all parties agree and remediation is complete, we cannot be certain there will be no additional cost relating to the Site.

We had total reserves of approximately $26,371 and $22,482 at March 31, 2019 and December 31, 2019, respectively, related to various environmental matters and sites, including those discussed above. These reserves are classified in the Consolidated Balance Sheets as $5,749 and $2,660 in accrued expenses at March 31, 2019 and December 31, 2019, respectively, and $20,622 and $19,822 in other non-current liabilities at March 31, 2019 and December 31, 2019, respectively. The amounts recorded for identified environmental liabilities are based on estimates. Periodically, we review amounts recorded and adjust them to reflect additional legal and technical information that becomes available. Uncertainties about the status of laws, regulations, regulatory actions, technology, and information related to individual sites make it difficult to develop an estimate of the reasonably possible aggregate environmental remediation exposure. Accordingly, these costs could differ significantly from our current estimates.

On April 19, 2016, the Canadian Ministry of the Environment and Climate Change (the “MoE”) issued a Director’s Order naming AVX Corporation, and others, as responsible parties with respect to a location in Hamilton, Ontario that was at one time the site of operations of Aerovox Canada, a former subsidiary of Aerovox Corporation, a predecessor of AVX. AVX has taken the position that any liability of Aerovox Canada for such site under the laws of Canada cannot be imposed on AVX. At present, it is unclear whether the MoE will seek to enforce such Canadian order against AVX, and whether, in the event it does so, AVX will have any liability under applicable law. AVX intends to contest any such course of action that may be taken by the MoE.

In connection with the same location, Union Gas Limited and Coca-Cola Refreshments Canada Company filed suits in the Superior Court of Justice for Ontario, Canada, against AVX Corporation, Aerovox Corp. and Cooper Industries, LLC seeking to recover the costs of remediation of the site and for damages associated with alleged contamination of the site. Those suits were filed on April 18, 2018, but not served on AVX until October 11, 2018, and are in their initial stages. AVX is considering its legal options but intends to vigorously defend these matters.

We also operate, or did at one time, on other sites that may have potential future environmental issues as a result of activities at sites during AVX’s long history of manufacturing operations or prior to the start of operations by AVX. Even though we may have rights of indemnity for such environmental matters at certain sites, regulatory agencies in those jurisdictions may require us to address such issues. Once it becomes probable that we will incur costs in connection with remediation of a site and such costs can be reasonably estimated, we establish reserves or adjust our reserves for our projected share of these costs. A separate account receivable is recorded for any indemnified costs. Our environmental reserves are not discounted and do not reflect any possible future insurance recoveries, which are not expected to be significant, but do reflect a reasonable estimate of cost sharing at multiple party sites or indemnification of our liability by a third party.

We are not involved in any pending or threatened environmental proceedings that would require curtailment of our operations. We continually expend funds to ensure that our facilities comply with applicable environmental regulations. While we believe that we are in compliance with applicable environmental laws, we cannot accurately predict future developments and do not necessarily have knowledge of all past occurrences on sites that we currently occupy. New environmental regulations may be enacted and we cannot determine the modifications, if any, in our operations that any such future regulations might require, or the cost of compliance with such regulations. Moreover, the risk of environmental liability and remediation costs is inherent in the nature of our business and, therefore, there can be no assurance that material environmental costs, including remediation costs, will not arise in the future.

On April 25, 2013, AVX was named as a defendant in a patent infringement case filed in the United States District Court for the District of Delaware captioned Greatbatch, Inc. v. AVX Corporation. This case alleged that certain AVX products infringe on one or more of six Greatbatch patents. On January 26, 2016, the jury returned a verdict in favor of the plaintiff in the first phase of a segmented trial and a mixed verdict in the second phase of a segmented trial, and found damages to Greatbatch in the amount of $37,500, which was recorded in fiscal 2016. That verdict was later vacated by the court on March 30, 2018. In fiscal 2018, we recorded a favorable accrual adjustment of $1,500 related to this patent infringement case. In a new trial, the amount of damages (excluding interest) was determined by a jury to be $22,100 on January 15, 2019 resulting in a favorable accrual adjustment of $13,900 for the year ended March 31, 2019. During the year ended March 31, 2019 the Company made a payment of $22,100 to an escrow account which is classified within “Other assets”. Additionally, during the nine months ended December 31, 2019, the Company made a payment of $5,646, representing pre-judgement interest, to an escrow account which is classified within "Other assets". The matter is now on appeal, the outcome of which could result in a material impact to the accrual for this case in the future.

On September 2, 2014, a subsidiary of AVX, American Technical Ceramics (“ATC”), was named as a defendant in a patent infringement case filed in the United States District Court of the Southern District of California captioned Presidio Components, Inc. v. American Technical Ceramics Corp. This case alleged that certain ATC products infringe on a Presidio patent. On April 18, 2016, the jury returned a verdict in favor of the plaintiff and found damages to Presidio. On August 17, 2016, the court issued a permanent injunction prohibiting ATC from manufacturing or selling the related products after November 16, 2016. Subsequently, on October 21, 2016, the Federal Circuit Court granted AVX’s request for a stay of the permanent injunction whereby ATC was allowed to continue to sell the disputed product until March 17, 2017 to anyone who was a customer prior to June 17, 2016. Any sales subsequent to November 16, 2016 pursuant to the stay of the permanent injunction were subject to court mandated intellectual property damages for each product sold. In December 2017, a panel of the Federal Circuit vacated the damage award to Presidio, vacated the injunction, and remanded the case for further proceedings to determine damages limited to “reasonable royalties” and to reconsider the requested injunction in light of its opinion and any additional facts. In June 2018, the District Court set the amount of royalties and re-issued the injunction. The appeals from the royalties and the injunction were denied by the Federal Circuit Court in November 2019. Accordingly, the Company recorded a reduction of the accrual of $11,664 during the three and nine months ended December 31, 2019. The remaining accrual balance as of December 31, 2019 was $25,919.

As of December 31, 2019, we had total reserves of $48,019 plus accrued interest in accrued expenses with respect to the two intellectual property cases discussed above. The amounts recorded are based on estimated outcomes. Amounts recorded are reviewed periodically and adjusted to reflect additional information that becomes available. Accordingly, these costs could differ significantly from our current estimates.

During calendar year 2014, AVX was named as a co-defendant in a series of cases filed in the United States and in the Canadian provinces of Quebec, Ontario, British Columbia, Saskatchewan and Manitoba alleging violations of United States, state and Canadian antitrust laws asserting that AVX and numerous other companies were participants in alleged price-fixing in the capacitor market. The cases in the United States were consolidated into the Northern District of California on October 2, 2014. Some plaintiffs have broken off from the United States class action and filed actions on their own, although AVX is not named in all of these independent actions. The cases in Canada have not been consolidated. These cases are still in progress. AVX believes it has meritorious defenses and intends to vigorously defend the cases. The class action case is currently scheduled for trial in the Spring or Summer of 2020.

We are involved in other disputes, warranty, and legal proceedings arising in the normal course of business. While we cannot predict the outcome of these other disputes and proceedings, we believe, based upon a review with legal counsel, that none of these other disputes or proceedings will have a material impact on our financial position, results of operations, comprehensive income (loss), or cash flows. However, we cannot be certain of the eventual outcome in these or other matters that may arise and their potential impact on our financial position, results of operations, comprehensive income (loss), or cash flows.