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Note 11 - Related Party Transactions - Schedule of Related Party Transactions (Details) - US Subsidiary Of Elekta Member - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Equipment purchases and de-install costs | $ 1,844,000 | $ 1,906,000
Costs incurred to maintain equipment | 1,094,000 | 759,000
Total related party transactions | 2,938,000 | 2,665,000
Accounts payable and other accrued liabilities | $ 497,000 | $ 1,992,000

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