Note 4 - Long-term Debt (Details Textual) | Nov. 22, 2021USD ($) | Oct. 19, 2020USD ($)$ / sharesshares | Jun. 25, 2020USD ($) | Nov. 13, 2019USD ($) | Sep. 30, 2021 | Dec. 31, 2021USD ($) | Dec. 31, 2020USD ($) | Aug. 11, 2020$ / sharesshares |
Long-term Debt, Total | | | | | | $ 2,205,000 | $ 2,515,000 | |
Reverse Stock Split [Member] | | | | | | | | |
Stockholders' Equity Note, Stock Split, Conversion Ratio | | 20 | | | | | | |
Warrant Issued to Lender [Member] | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | 1,672,290 | | | | | | 33,445,792 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | $ 0.20 | | | | | | $ 0.01 |
Warrants and Rights Outstanding, Term (Year) | | 5 years | | | | | | |
Gain (Loss) on Cancellation of Warrant | $ (2,500,000) | | | | | | | |
Second Lien Credit Facility [Member] | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | 0 | (4,108,000) | |
Line of Credit [Member] | First Lien Credit Facility [Member] | | | | | | | | |
Long-term Line of Credit, Total | | | | | | $ 71,400,000 | | |
Debt Instrument, Spread on Elected Variable Rate | | | | | | 0.50% | | |
Debt Instrument, Debt Default, Basis Spread on Variable Rate | | | | | 3.00% | 3.00% | | |
Line of Credit Facility, Interest Rate at Period End | | | | | | 8.75% | | |
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 of Proven Reserves Required | | | | | | 90.00% | | |
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 of PDP Reserves Required | | | | | | 95.00% | | |
Debt Instrument, Covenant, Working Capital Reserve | | | $ 3,000,000 | | | | | |
Debt Instrument, Covenant, Maximum Capital Expenditures | | | $ 3,000,000 | | | | | |
Debt Instrument, Covenant, Minimum Asset Coverage Ratio for Capital Expenditures | | | 1.60 | | | | | |
Debt Instrument, Covenant, Maximum Line of Credit Outstanding for Capital Expenditures | | | $ 50,000,000 | | | | | |
Debt Instrument, Covenant, Maximum Outstanding and Undisputed Accounts Payable | | | 7,500,000 | | | | | |
Debt Instrument, Covenant, Maximum Undisputed Accounts Payable Outstanding with 60 to 90 Days | | | 2,000,000 | | | | | |
Debt Instrument, Covenant, Maximum Undisputed Accounts Payable Outstanding with Over 90 Days | | | 1,000,000 | | | | | |
Debt Instrument, Covenant, Maximum Legal and Professional Fees Excluded from General and Administrative Expense Limitations | | | 1,000,000 | | | | | |
Debt Instrument, Covenant, Maximum Additional Subordinated Debt Allowed to Finance Capital Expenditures | | | 25,000,000 | | | | | |
Line of Credit Facility, Current Borrowing Capacity | | | 102,000,000 | | | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | | | $ 0 | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | General and Administrative Expenses for Quarter Ending June 30, 2020 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Quarterly General and Administrative Expenses | | | 9,000,000 | | | | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | General and Administrative Expenses for Quarter Ending September 30, 2020 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Quarterly General and Administrative Expenses | | | 8,250,000 | | | | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | General and Administrative Expenses for Quarter Ending December 31, 2020 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Quarterly General and Administrative Expenses | | | 6,900,000 | | | | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | General and Administrative Expenses for Year End December 31, 2021 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Yearly General and Administrative Expenses | | | 6,500,000 | | | | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | General and Administrative Expenses After Year End December 31, 2021 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Yearly General and Administrative Expenses | | | $ 5,000,000 | | | | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | Minimum [Member] | | | | | | | | |
Debt Instrument, Spread on Elected Variable Rate | | | | | | 2.50% | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | 1.50% | | |
Line of Credit [Member] | First Lien Credit Facility [Member] | Maximum [Member] | | | | | | | | |
Debt Instrument, Spread on Elected Variable Rate | | | | | | 3.50% | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | 2.50% | | |
Debt Instrument, Covenant, Total Debt to EBITDAX Ratio | | | 2.75 | | | | | |
Debt Instrument, Covenant, Asset Coverage Ratio, Current | | | 1.15 | | | | | |
Debt Instrument, Covenant, Asset Coverage Ratio, Noncurrent | | | 1.25 | | | | | |
Line of Credit [Member] | Second Lien Credit Facility [Member] | | | | | | | | |
Long-term Line of Credit, Total | | | | | | $ 144,900,000 | | |
Debt Instrument, Covenant, Maximum Outstanding and Undisputed Accounts Payable | | | $ 7,500,000 | | | | | |
Debt Instrument, Covenant, Maximum Undisputed Accounts Payable Outstanding with 60 to 90 Days | | | 2,000,000 | | | | | |
Debt Instrument, Covenant, Maximum Undisputed Accounts Payable Outstanding with Over 90 Days | | | 1,000,000 | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | $ 100,000,000 | | | | |
Proceeds from Lines of Credit, Total | | | | $ 95,000,000 | | | | |
Line of Credit, Exit Fee | | | | | | $ 10,000,000 | $ 10,000,000 | |
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 Proven Reserves | | | | | | | 90.00% | |
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 Required PDP Reserves | | | | | | | 95.00% | |
Gain (Loss) on Extinguishment of Debt, Total | | $ 4,100,000 | | | | | | |
Line of Credit [Member] | Second Lien Credit Facility [Member] | General and Administrative Expenses for Quarter Ending June 30, 2020 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Quarterly General and Administrative Expenses | | | 9,000,000 | | | | | |
Line of Credit [Member] | Second Lien Credit Facility [Member] | General and Administrative Expenses for Quarter Ending September 30, 2020 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Quarterly General and Administrative Expenses | | | 8,250,000 | | | | | |
Line of Credit [Member] | Second Lien Credit Facility [Member] | General and Administrative Expenses for Year End December 31, 2021 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Yearly General and Administrative Expenses | | | 6,500,000 | | | | | |
Line of Credit [Member] | Second Lien Credit Facility [Member] | General and Administrative Expenses After Year End December 31, 2021 [Member] | | | | | | | | |
Debt Instrument, Covenant, Maximum Yearly General and Administrative Expenses | | | $ 5,000,000 | | | | | |
Line of Credit [Member] | Second Lien Credit Facility [Member] | Maximum [Member] | | | | | | | | |
Debt Instrument, Covenant, Asset Coverage Ratio, Noncurrent, Year Two | | | 1.45 | | | | | |
Debt Instrument, Covenant, Asset Coverage Ratio, Noncurrent, after Year Two | | | 1.55 | | | | | |
Construction Loans [Member] | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | 4.90% | | |
Debt Instrument, Periodic Payment, Total | | | | | | $ 35,672 | | |
Long-term Debt, Total | | | | | | $ 2,500,000 | $ 2,800,000 | |