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Note 2 - Accounting Policies (Details Textual)		12 Months Ended
	Jun. 12, 2020 USD ($)	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	May 07, 2024	Jan. 01, 2024 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)
Advertising Expense		$ 98,000	$ 165,000
Property, Plant, and Equipment, Salvage Value		0
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization		72,854,000
Gain (Loss) on Sale of Assets and Asset Impairment Charges		(3,084,000)	(940,000)
Asset Impairment Charges		3,084,000	$ 940,000
Lessee, Operating Lease, Term of Contract (Year)			10 years
Asset Retirement Obligation		$ 1,200,000	$ 650,000				$ 360,000
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | shares		6,497,000	6,358,000
Number of Reportable Segments		2	2
Goodwill and Intangible Asset Impairment		$ 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		0	144,000
GKCE [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 12,556,000	$ 3,553,000
Accounts Receivable, after Allowance for Credit Loss		$ 11,229,000	1,626,000		$ 1,626,000	$ 1,118,000
Gamma Knife Units [Member]
Number of Customer with Intent to Terminate Contract		2
Asset Retirement Obligation		$ 1,200,000
Other Gamma Knife Units [Member]
Asset Retirement Obligation		0
RI Companies [Member]
Business Acquisition, Percentage of Voting Interests Acquired				60.00%
Rental Income from Medical Services [Member]
Revenue from Contract with Customer, Including Assessed Tax		15,629,000	17,772,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 9,952,000	$ 10,133,000
Revenue Sharing Arrangements [Member]
Percentage of Revenues		70.00%	67.00%
Equipment Sales [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 155,000	$ 200,000
Minimum [Member]
Property, Plant, and Equipment, Salvage Value			140,000
Minimum [Member] | RI Companies [Member]
Business Combination, Net Payment Terms (Year)				30 years
Maximum [Member]
Property, Plant, and Equipment, Salvage Value			300,000
Maximum [Member] | RI Companies [Member]
Business Combination, Net Payment Terms (Year)				60 years
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		$ 54,266,000	70,635,000
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization		$ 37,002,000	51,976,000
Gamma Knife Units [Member]
Asset Retirement Obligation Impairment			450,000
Tangible Asset Impairment Charges			2,634,000
Other Gamma Knife Units [Member]
Asset Retirement Obligation Impairment			290,000
Asset Impairment Charges			$ 650,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Locations		17	15
Number of Major Customers		2	1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage		35.00%	48.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage		27.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Locations		1	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Location One [Member]
Concentration Risk, Percentage		32.00%	30.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Location Two [Member]
Concentration Risk, Percentage			31.00%

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