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Note 2 - Accounting Policies (Details Textual)
6 Months Ended 12 Months Ended
Jun. 12, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Advertising Expense     $ 211,000 $ 237,000
Net Income (Loss) Attributable to Parent, Total     $ 194,000 $ (7,058,000)
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares     $ 0.03 $ (1.14)
Interest Costs Capitalized     $ 0 $ 119,000
Gain (Loss) on Sale of Assets and Asset Impairment Charges     $ (105,000) $ (8,264,000)
Lessee, Operating Lease, Term of Contract (Year)     10 years  
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ / shares       $ 2.25
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ / shares       $ 3.90
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]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     13,000 13,000
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares       406,000
GK Peru [Member]        
Accounts Receivable, Related Parties   $ 0 $ 0 $ 0
GKCE [Member]        
Accounts Receivable, Related Parties   467,000 $ 435,000 467,000
Gamma Knife Units [Member]        
Number of Customer with Intent to Terminate Contract     4  
Asset Retirement Obligation, Ending Balance   0   0
Gamma Knife Units One [Member]        
Asset Retirement Obligation, Ending Balance     $ 105,000  
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     14,719,000 16,204,000
Patient Income [Member]        
Revenue from Contract with Customer, Including Assessed Tax     2,909,000 1,633,000
Salvage Value [Member]        
Net Income (Loss) Attributable to Parent, Total     $ 342,000  
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares     $ 0.06  
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   75,241,000 $ 72,972,000 75,241,000
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization   $ 45,416,000 $ 45,061,000 $ 45,416,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Number of Major Customers     17  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]        
Number of Major Customers       18
Concentration Risk, Percentage     34.00% 35.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Number of Major Customers     2 4
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]        
Concentration Risk, Percentage     31.00% 11.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]        
Concentration Risk, Percentage     10.00% 11.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member]        
Concentration Risk, Percentage       11.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Four [Member]        
Concentration Risk, Percentage       20.00%