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Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Thousands, shares in Millions |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
May 04, 2022 | Oct. 23, 2020 | May 04, 2022 | Mar. 31, 2022 | Mar. 31, 2021
Treasury Stock, Shares, Acquired (in shares) |  |  |  | 0.7 | 0.5
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 14,800 | $ 8,118
Subsequent Event [Member] |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  | 0.6 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 11,900 |  |
Lenders [Member] |  |  |  |  |
Line of Credit Facility, Revolver Commitment, Amount |  | $ 45,000 |  | $ 45,000 |
Lenders [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Increase in Borrowing Capacity |  | $ 50,000 |  |  |
Lenders [Member] | Subsequent Event [Member] |  |  |  |  |
Line of Credit Facility, Revolver Commitment, Amount | $ 65,000 |  |  |  |
Lenders [Member] | Subsequent Event [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.10% |  |  |  |
Lenders [Member] | Subsequent Event [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |  |  |  |
Lenders [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Increase in Borrowing Capacity | $ 75,000 |  | $ 75,000 |  |

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