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Note 6 - Long-term Debt (Details Textual) $ in Thousands		12 Months Ended
	Feb. 08, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Long-Term Debt, Maturity, Year One		$ 15,286
Long-Term Debt, Maturity, Year Four		9,286
Long-Term Debt, Maturity, Year Five		64,611
Interest Rate Swap [Member]
Derivative Liability, Notional Amount		6,800
Interest Rate Swap [Member] | Interest Expense [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total		$ 100	$ (300)	$ (200)
Credit Agreement [Member]
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
Credit Agreement [Member] | Term Loan 2 [Member]
Debt Instrument, Interest Rate, Effective Percentage		0.95%
Long-Term Debt, Maturity, Year One		$ 9,300
Long-Term Debt, Maturity, Year Five		$ 3,100
Credit Agreement [Member] | Term Loan [Member]
Debt Instrument, Interest Rate, Effective Percentage		0.78%
Long-Term Debt, Maturity, Year One		$ 6,000
Long-Term Debt, Maturity, Year Four		$ 3,000
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan 2 [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate		0.85%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan 2 [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.65%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate		0.68%
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument, Interest Rate, Effective Percentage		0.93%
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, LIBOR Floor	0.25%
Credit Agreement [Member] | Revolving Credit Facility [Member] | Truist Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 125,000		$ 75,000
Credit Agreement [Member] | Revolving Credit Facility [Member] | Truist Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, LIBOR Floor	0.25%		0.00%
Credit Agreement [Member] | Revolving Credit Facility [Member] | Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, LIBOR Floor		0.00%
Credit Agreement [Member] | Letter of Credit [Member]
Letters of Credit Outstanding, Amount		$ 0

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