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Note 9 - Related Party Transactions and Balances | 9 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Related Party Transactions Disclosure [Text Block] | Note 9. Related Party Transactions and Balances The Company’s Gamma Knife business is operated through its GKF subsidiary in which the Company holds an indirect 81% interest. The remaining 19% of GKF is owned by a wholly owned U.S. subsidiary of Elekta, which is the manufacturer of the Gamma Knife. Since the Company purchases its Gamma Knife units from Elekta, there are significant related party transactions with Elekta, such as equipment purchases, commitments to purchase and service equipment, and costs to maintain the equipment. The following table summarizes related party activity for the three and nine-month periods ended September 30, 2025 and 2024:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Equipment purchases and de-install costs |  | $ | 1,243,000 |  |  | $ | 524,000 |  |  | $ | 4,412,000 |  |  | $ | 3,461,000 |
Costs incurred to maintain equipment |  |  | 278,000 |  |  |  | 170,000 |  |  |  | 729,000 |  |  |  | 510,000 |
Total related party transactions |  | $ | 1,521,000 |  |  | $ | 694,000 |  |  | $ | 5,141,000 |  |  | $ | 3,971,000 |
The Company also had commitments to purchase and install two Esprit units, two LINACs, and service the related equipment of $11,045,000 as of September 30, 2025. Related party liabilities on the condensed consolidated balance sheets consist of the following as of September 30, 2025 and December 31, 2024:
|  | September 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Accounts payable, asset retirement obligation and other accrued liabilities |  | $ | 1,471,000 |  |  | $ | 2,270,000 |

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