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Note 3 - Long-term Debt Financing (Details Textual)		3 Months Ended			6 Months Ended
	Apr. 09, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Finance Lease, Principal Payments					$ 8,919,000	$ 1,981,000
Gain (Loss) on Extinguishment of Debt, Total		$ (401,000)		$ 0	(401,000)	$ 0
Long-term Debt, Total		16,041,000			16,041,000
Gamma Knife Debt and Finance Leases [Member]
Short-term Debt, Refinanced, Amount	$ 6,774,000
The Credit Agreement [Member] | Fifth Third Bank, N.A. [Member]
Debt Instrument, Term (Year)	5 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 22,000,000
Number of Debt Instruments	3
Gain (Loss) on Extinguishment of Debt, Total		(401,000)
Debt Issuance Costs, Net, Total		$ 310,000			$ 310,000
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio	1.25
Debt Instrument, Covenant, Maximum Funded Debt to EDITDA Ratio	3.0
The Credit Agreement, First Loan Facility [Member] | Fifth Third Bank, N.A. [Member]
Debt Instrument, Face Amount	$ 9,500,000
Finance Lease, Principal Payments			$ 1,665,000
Cash, Ending Balance	1,061,000
The Credit Agreement, Second Loan Facility [Member] | Fifth Third Bank, N.A. [Member]
Debt Instrument, Face Amount	5,500,000
Finance Lease, Principal Payments	$ 5,026,000
The Credit Agreement, Third Loan Facility [Member] | Fifth Third Bank, N.A. [Member] | Revolving Credit Facility [Member]
Debt Instrument, Term (Year)	5 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 7,000,000
The Credit Agreement, Third Loan Facility [Member] | Fifth Third Bank, N.A. [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%

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The maximum funded debt to EBITDA ratio allowed under the covenant of the debt instrument.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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