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Note 6 - Long-term Debt (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 08, 2021 USD ($) | May 02, 2018 USD ($)
Long-Term Debt, Maturity, Year One | $ 15,286 |  |  |
Long-Term Debt, Maturity, Year Four | 12,286 |  |  |
Long-Term Debt, Maturity, Year Five | 9,286 |  |  |
Long-Term Debt, Maturity, Year Two | 15,286 |  |  |
Long-Term Debt, Maturity, Year Three | 32,875 |  |  |
Interest Rate Swap [Member] |  |  |  |
Derivative Liability, Notional Amount | 9,800 |  |  |
Interest Rate Swap [Member] | Interest Expense [Member] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax, Total | $ (300) | $ (200) |  |
Credit Agreement [Member] |  |  |  |
Fixed Charge Coverage Ratio | 1.25 |  |  |
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio | 5.0 |  |  |
Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |
Fixed Charge Coverage Ratio |  |  | 1.25 |
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio |  |  | 5.0 |
Credit Agreement [Member] | Term Loan 2 [Member] |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.00% |  |  |
Long-Term Debt, Maturity, Year One | $ 9,300 |  |  |
Long-Term Debt, Maturity, Year Four | 9,300 |  |  |
Long-Term Debt, Maturity, Year Five | 3,100 |  |  |
Long-Term Debt, Maturity, Year Two | 9,300 |  |  |
Long-Term Debt, Maturity, Year Three | $ 9,300 |  |  |
Credit Agreement [Member] | Term Loan 2 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.85% |  |  |
Credit Agreement [Member] | Term Loan 2 [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.65% |  |  |
Credit Agreement [Member] | Term Loan [Member] |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 0.83% |  |  |
Long-Term Debt, Maturity, Year One | $ 6,000 |  |  |
Long-Term Debt, Maturity, Year Four | 3,000 |  |  |
Long-Term Debt, Maturity, Year Two | 6,000 |  |  |
Long-Term Debt, Maturity, Year Three | $ 6,000 |  |  |
Credit Agreement [Member] | Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.68% |  |  |
Credit Agreement [Member] | Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |  |
Revolving Credit Facility [Member] | Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument, LIBOR Floor |  |  | 0.25% |
Revolving Credit Facility [Member] | BB&T [Member] | Credit Agreement [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75,000 |  |  | $ 75,000
Revolving Credit Facility [Member] | BB&T [Member] | Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 125,000 |
Revolving Credit Facility [Member] | BB&T [Member] | Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument, LIBOR Floor |  |  | 0.25% |
Revolving Credit Facility [Member] | Fifth Third Bank [Member] | Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, LIBOR Floor | 0.00% |  |  |
Letter of Credit [Member] | Credit Agreement [Member] |  |  |  |
Letters of Credit Outstanding, Amount | $ 25,700 |  |  |

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