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Note M - Subsequent Events (Details Textual) - Wells Fargo Bank, N.A. [Member] - Credit Agreement [Member] - USD ($) $ in Millions | Feb. 13, 2024 | Aug. 18, 2021 | Dec. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | May 24, 2021
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Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 20.0
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years |  |  |  | $ 15.0 | $ 10.0 |
Maximum [Member] |  |  |  |  |  |
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years |  |  | $ 7.5 |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.29% |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 12.5 |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years | 7.5 |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument Covenant Capital Expenditures Limitation, Amount, Next Twelve Years | $ 6.5 |  |  |  |  |
Subsequent Event [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |  |  |  |  |

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- Definition The amount of debt instrument covenant capital expenditures limitation for next twelve years. + References No definition available. + 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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