Note 9 - Commitments and Contingencies	9 Months Ended
Sep. 30, 2022
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	Note 9. Commitments On December 20, 2018, the Company signed Second Amendments to two System Build Agreements for the Company’s second and third Mevion PBRT units. The Company and Mevion Medical Systems Inc. (“Mevion”) have agreed to upgrade the second and third PBRT units for which the Company has purchase commitments. The Company is actively seeking sites for these units but, to date, has not entered into agreements with any party for either placement of a PBRT unit or the related financing. The Company projects that it will be required to commence delivery of the second and third PBRT units no later than 2023. In the event the Company is unable to enter into customer agreements within the requisite time frame or receive an extension from Mevion, the Company could forfeit its deposits. During the year-ended December 31, 2020, the Company impaired these deposits and wrote-off the deposits and related capitalized interest. As of September 30, 2022, the Company had commitments, after deposits, to purchase two MEVION S250i PBRT systems for $34,000,000. As of September 30, 2022, the Company had commitments to install four Leksell Gamma Knife Icon Systems (“Icon”) and two Gamma Plan workstations at existing customer sites, and purchase three Linear Accelerator (“LINAC”) systems. Two LINACS will be placed at future customer sites and one LINAC system will be placed at the Company’s new site in Puebla, Mexico, which is expected to begin operations in the first half of 2023, pending regulatory approval. The Company also has a commitment to upgrade the Gamma Knife unit at its stand-alone facility in Ecuador to an Icon. The remaining Icon upgrades and LINAC purchases are scheduled to occur between 2023 and 2024. The Company expects to upgrade the equipment in Ecuador in first half of 2023, pending regulatory approval. The Company has a commitment from DFC to finance this upgrade. Total Gamma Knife and LINAC commitments as of September 30, 2022 were $13,243,000. It is the Company’s intent to finance these commitments. There are no significant cash requirements, pending financing, for these commitments in the next 12 months. There can be no assurance that financing will be available for the Company’s current or future projects, or at terms that are acceptable to the Company. However, the Company currently has cash on hand of $11,664,000 and a line of credit of $7,000,000 to fund these projects. On September 4, 2022, the Company entered into a Maintenance and Support Agreement (the “Mevion Service Agreement”), which provides for maintenance and support of the Company’s PBRT unit at Orlando Health from September 2022 through April 2026. The agreement requires an annual prepayment of $1,800,000 for the current contractual period ( one year). This payment portion was recorded as a prepaid contract and will be amortized over the one-year service period. As of September 30, 2022 , the Company had commitments to service and maintain its Gamma Knife and PBRT equipment. The service commitments are carried out via contracts with Mevion, Elekta and Mobius Imaging, LLC. In addition, in April 2019, the Company signed agreements to service the Icon upgrades which will be installed at various dates between 2023 and 2024. The Company’s commitments to purchase two LINAC systems also include a 9-year and 5-year agreement to service the equipment, respectively. Total service commitments as of September 30, 2022 were $17,166,000. The Gamma Knife and certain other service contracts are paid monthly, as service is performed. The Company believes that cash flow from cash on hand and operations will be sufficient to cover these payments.

Note 9 - Commitments and Contingencies

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Text Block]

Note 9. Commitments

On December 20, 2018, the Company signed Second Amendments to two System Build Agreements for the Company’s second and third Mevion PBRT units. The Company and Mevion Medical Systems Inc. (“Mevion”) have agreed to upgrade the second and third PBRT units for which the Company has purchase commitments. The Company is actively seeking sites for these units but, to date, has not entered into agreements with any party for either placement of a PBRT unit or the related financing. The Company projects that it will be required to commence delivery of the second and third PBRT units no later than 2023. In the event the Company is unable to enter into customer agreements within the requisite time frame or receive an extension from Mevion, the Company could forfeit its deposits. During the year-ended December 31, 2020, the Company impaired these deposits and wrote-off the deposits and related capitalized interest. As of September 30, 2022, the Company had commitments, after deposits, to purchase two MEVION S250i PBRT systems for $34,000,000.

As of September 30, 2022, the Company had commitments to install four Leksell Gamma Knife Icon Systems (“Icon”) and two Gamma Plan workstations at existing customer sites, and purchase three Linear Accelerator (“LINAC”) systems. Two LINACS will be placed at future customer sites and one LINAC system will be placed at the Company’s new site in Puebla, Mexico, which is expected to begin operations in the first half of 2023, pending regulatory approval. The Company also has a commitment to upgrade the Gamma Knife unit at its stand-alone facility in Ecuador to an Icon. The remaining Icon upgrades and LINAC purchases are scheduled to occur between 2023 and 2024. The Company expects to upgrade the equipment in Ecuador in first half of 2023, pending regulatory approval. The Company has a commitment from DFC to finance this upgrade. Total Gamma Knife and LINAC commitments as of September 30, 2022 were $13,243,000. It is the Company’s intent to finance these commitments. There are no significant cash requirements, pending financing, for these commitments in the next 12 months. There can be no assurance that financing will be available for the Company’s current or future projects, or at terms that are acceptable to the Company. However, the Company currently has cash on hand of $11,664,000 and a line of credit of $7,000,000 to fund these projects.

On September 4, 2022, the Company entered into a Maintenance and Support Agreement (the “Mevion Service Agreement”), which provides for maintenance and support of the Company’s PBRT unit at Orlando Health from September 2022 through April 2026. The agreement requires an annual prepayment of $1,800,000 for the current contractual period ( one year). This payment portion was recorded as a prepaid contract and will be amortized over the one-year service period.

As of September 30, 2022 , the Company had commitments to service and maintain its Gamma Knife and PBRT equipment. The service commitments are carried out via contracts with Mevion, Elekta and Mobius Imaging, LLC. In addition, in April 2019, the Company signed agreements to service the Icon upgrades which will be installed at various dates between 2023 and 2024. The Company’s commitments to purchase two LINAC systems also include a 9-year and 5-year agreement to service the equipment, respectively. Total service commitments as of September 30, 2022 were $17,166,000. The Gamma Knife and certain other service contracts are paid monthly, as service is performed. The Company believes that cash flow from cash on hand and operations will be sufficient to cover these payments.