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Note 5 - Long-Term Debt (Details Textual) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 09, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Finance Lease, Principal Payments |  |  | $ (0) | $ 8,919,000
Gain (Loss) on Extinguishment of Debt, Total |  |  | 0 | (401,000)
Long-Term Debt, Total |  |  | 13,665,000 |
Amortization of Debt Issuance Costs |  |  | 84,000 | 59,000
Debt Issuance Costs, Net, Total |  |  | 198,000 | 294,000
Gamma Knife Debt and Finance Leases [Member] |  |  |  |
Short-term Debt, Refinanced, Amount | $ 6,774,000 |  |  |
Notes Payable, Other Payables [Member] |  |  |  |
Debt Issuance Costs, Net, Total |  |  | 198,000 |
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 |  |  |
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 and Second Loan Facility [Member] | Fifth Third Bank, N.A. [Member] |  |  |  |
Debt Instrument, Face Amount | $ 9,500,000 |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  | (401,000)
Debt Issuance Costs, Gross |  |  |  | 310,000
Long-Term Debt, Total |  |  | 12,624,000 | $ 14,437,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 48.00%
The Credit Agreement, First Loan Facility [Member] | Fifth Third Bank, N.A. [Member] |  |  |  |
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 |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.25%
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% |  |  |
DFC Loan [Member] |  |  |  |
Debt Issuance Costs, Gross |  |  | 9,000 | $ 15,000
Long-Term Debt, Total |  |  | $ 1,041,000 | $ 1,261,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.67% |

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