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Note 8 - Indebtedness (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Feb. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Interest Rate Swap [Member] |  |  |  |
Derivative, Notional Amount | $ 11,428,568 | $ 20,000,000 | $ 11,428,568 |
Derivative, Term of Contract (Year) |  | 5 years |  |
Derivative, Fixed Interest Rate |  | 2.70% |  |
Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | 366,000 | $ 388,000
Interest Rate Swap [Member] | Other Current Liabilities [Member] |  |  |  |
Derivative, Fair Value, Net, Total | (465,000) |  | (465,000) |
Subsidiary Guarantors [Member] | Unsecured Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |
Debt Instrument, Face Amount |  | $ 70,000,000 |  |
Letters of Credit Outstanding, Amount | 700,000 |  | 700,000 |
Long-term Debt, Total | $ 0 |  | $ 0 |
Debt Instrument, Interest Rate, Effective Percentage | 1.15% |  | 1.15% |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Unsecured Term Loan [Member] |  |  |  |
Debt Instrument, Face Amount | $ 20,000,000 |  | $ 20,000,000 |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |  |  |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% | 1.50% |  |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.00% | 0.00% |  |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Prime Rate [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% | 0.25% |  |
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 50,000,000 |  | $ 50,000,000 |

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