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Note 5 - Bank Debt (Details Textual) $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 16, 2020 USD ($) | Apr. 15, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Long-term Debt, Gross |  |  | $ 161,113 |  |  | $ 180,150
Debt Issuance Costs, Net, Total |  |  | $ 7,339 |  |  | 6,512
Leverage Ratio |  |  | 2.97 |  |  |
Debt Service Coverage Ratio |  |  | 1.34 |  |  |
Proceeds from Notes Payable, Total |  |  | $ 10,000 | $ 0 |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  | 2.92% |  |  |
Derivative, Variable Interest Rate |  |  | 6.42% |  |  |
Derivative, Amount of Hedged Item |  |  | $ 139,000 |  |  |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage Unhedged Amount |  |  | 4.00% |  |  |
London Interbank Offered Rate (LIBOR) Swap Rate [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivative, Basis Spread on Variable Rate |  |  | 3.50% |  |  |
Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Annual Capital Expenditures |  | $ 30,000 |  |  |  |
Debt Instrument, Covenant, Maximum Leverage Ratio for Dividends |  | 2.0 |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  | $ (19,000) |  |  |
Long-term Debt, Gross |  |  | 161,000 |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  | 45,300 |  |  |
Debt Instrument, Liquidity |  |  | 52,600 |  |  |
Debt Issuance Costs, Net, Total |  | $ 1,900 | 7,300 |  | $ 7,900 | $ 6,500
Debt Instrument, Unhedged Portion |  |  | $ 22,000 |  |  |
Credit Agreement [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  | 2.92% |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Variable Rate Floor |  | 0.50% |  |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.75% |  |  |  |
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 4.00% |  |  |  |
Credit Agreement [Member] | Through December 31, 2020 [Member] |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio |  | 1.05 |  |  |  |
Credit Agreement [Member] | After December 31, 2021 [Member] |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio |  | 1.25 |  |  |  |
Credit Agreement [Member] | Term Loan [Member] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 86,000 |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 120,000 |  |  |
Long-term Line of Credit, Total |  |  | 75,000 |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Derivative, Notional Amount |  |  | 53,000 |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |
Proceeds from Notes Payable, Total | $ 10,000 |  |  |  |  |
Notes Payable, Total |  |  | $ 10,000 |  |  |

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