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Note 19 - Subsequent Events (Details Textual) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 08, 2021 USD ($) | Feb. 01, 2021 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 | May 02, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 2 years |  |
Credit Agreement [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] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.85% |  |
Credit Agreement [Member] | Term Loan 2 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.65% |  |
Credit Agreement [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.68% |  |
Credit Agreement [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.50% |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | BB&T [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 75,000,000.0 |  | $ 75,000,000
Subsequent Event [Member] | Credit Agreement [Member] |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount | $ 250,000 |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.15% |  |  |  |
Fixed Charge Coverage Ratio | 1.25 |  |  |  |
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio | 5.0 |  |  |  |
Subsequent Event [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, LIBOR Floor | 0.25% |  |  |  |
Subsequent Event [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] | BB&T [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 125,000,000.0 |  |  |  |
Subsequent Event [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] | BB&T [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, LIBOR Floor | 0.25% |  |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |
Restricted Stock [Member] | Subsequent Event [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 5 years |  |  |

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