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Note 7 - Revolving Line of Credit and Long-term Debt (Details Textual) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2023 | Jun. 30, 2023 | Jun. 30, 2021 | Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 100.0 | $ 75.0
Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75.0 |  | $ 75.0 |  |
Line of Credit Facility, Interest Rate During Period |  |  | 6.50% |  |
Minimum [Member] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.15% |  |  |  |
Maximum [Member] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 58.5 |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |
London Interbank Offered Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |
London Interbank Offered Rate [Member] | Revolving Credit Facility [Member] | Forecast [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |  |
London Interbank Offered Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00% |
London Interbank Offered Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |  |  |  |
Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.00% |
Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |  |  |  |
Term Loan [Member] |  |  |  |  |
Debt Instrument, Face Amount | $ 25.0 |  |  |  |
Debt Instrument, Annual Principal Payment | $ 3.6 |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |

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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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