Note 7 - Revenue Recognition (Details Textual)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Contract with Customer, Returns as Percent of Net Sales	0.04%	0.04%
Number of Reportable Segments	1
Number of Operating Segments	6
Minimum [Member]
Contract with Customer, Distributor Discount	20.00%
Maximum [Member]
Contract with Customer, Distributor Discount	40.00%

The percentage of distributor discount included within calculation of net sales

No definition available.

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- Definition

The percentage of returns to net sales of contracts with customers.

+ References

No definition available.

+ Details

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

+ Details

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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