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Note 2 - Accounting Policies (Details Textual) |  | 12 Months Ended
--- | --- | ---
Jun. 12, 2020 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
Advertising Expense |  | $ 233,000 | $ 211,000
Net Income (Loss) Attributable to Parent, Total |  | $ 1,328,000 | $ 194,000
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares |  | $ 0.21 | $ 0.03
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total |  | $ 74,237,000 |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  | $ (0) | $ (105,000)
Lessee, Operating Lease, Term of Contract (Year) |  | 10 years |
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | shares |  | 6,297,000 | 6,044,000
Number of Reportable Segments |  | 2 | 2
Goodwill and Intangible Asset Impairment, Total |  | $ 0 | $ 0
Gamma Knife Center Ecuador S.A. (GKCE) [Member] |  |  |
Goodwill, Acquired During Period | $ 1,265,000 |  |
Gamma Knife Center Ecuador S.A. (GKCE) [Member] | Trade Names [Member] |  |  |
Indefinite-lived Intangible Assets Acquired | $ 78,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | shares |  | 123,000 | 123,000
Share-Based Payment Arrangement, Option [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  | 20,000 | 31,000
GK Peru [Member] |  |  |
Accounts Receivable, Related Parties |  | $ 0 | $ 0
GKCE [Member] |  |  |
Accounts Receivable, Related Parties |  | 862,000 | $ 435,000
Gamma Knife Units [Member] |  |  |
Number of Customer with Intent to Terminate Contract |  |  | 4
Gamma Knife Units One [Member] |  |  |
Asset Retirement Obligation, Ending Balance |  |  | $ 105,000
Gamma Knife Unit Removed [Member] |  |  |
Asset Retirement Obligation, Cash Paid to Settle |  | 457,000 |
Other Gamma Knife Units [Member] |  |  |
Asset Retirement Obligation, Ending Balance |  | 0 |
Rental Income from Medical Services [Member] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 16,655,000 | 14,719,000
PBRT Services [Member] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 8,952,000 | 6,058,000
Patient Income [Member] |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 3,091,000 | 2,909,000
Salvage Value [Member] |  |  |
Net Income (Loss) Attributable to Parent, Total |  | $ 17,000 |
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares |  | $ 0.00 |
Minimum [Member] |  |  |
Property, Plant, and Equipment, Salvage Value |  | $ 140,000 | 175,000
Maximum [Member] |  |  |
Property, Plant, and Equipment, Salvage Value |  | $ 300,000 | 400,000
Office Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 3 years |
Office Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 10 years |
Building [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 20 years |
Proton Beam Radiation Therapy PBRT [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 20 years |
Gamma Knife And Radiation Therapy Equipment [Member] |  |  |
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total |  | $ 69,306,000 | 68,994,000
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization |  | $ 47,992,000 | $ 43,400,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Number of Major Customers |  | 15 | 17
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |
Concentration Risk, Percentage |  | 45.00% | 34.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Number of Major Customers |  | 4 | 2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member] |  |  |
Concentration Risk, Percentage |  | 12.00% | 31.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member] |  |  |
Concentration Risk, Percentage |  | 14.00% | 10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member] |  |  |
Concentration Risk, Percentage |  | 16.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Four [Member] |  |  |
Concentration Risk, Percentage |  | 22.00% |

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