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Note 5 - Long-term Debt (Details Textual)
6 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Financial Covenants, Minimum Current Ratio 1  
Financial Covenants, Interest Coverage Ratio 2.5  
Financial Covenants, Total Debt to EBITDAX Ratio 3.5  
Debt Instrument Covenants, Extraordinary Expenses Included in Determining EBITDAX $ 1,000,000  
Interest Coverage Ratio 17.11  
Total Debt to EBITDAX Ratio 1.49  
Current Ratio 1.48  
Line of Credit Covenant, Percentage of Net Proceeds to be Used for Repayment 100.00%  
Line of Credit Covenant, Cash and Liquid Investments Triggering Credit Repayment $ 10,000,000  
Long-term Debt, Total 115,487,000 $ 87,616,000
Line of Credit [Member]    
Long-term Line of Credit, Total 112,000,000  
Line of Credit Facility, Maximum Borrowing Capacity 300,000,000  
Line of Credit Facility, Current Borrowing Capacity $ 175,000,000  
Line of Credit, Market Value of Property, Minimum Percentage 5.00%  
Line of Credit, Reduced Collateral Value, Minimum Percentage 5.00%  
Line of Credit, Default, Minimum Interest Rate 3.00%  
Debt Instrument, Spread on Elected Variable Rate 0.50%  
Line of Credit Facility, Interest Rate at Period End 5.10%  
Debt Instrument, Maturity Date May 16, 2021  
Debt Instrument, Collateral Eligible, Minimum Percent of PV-10 Required 90.00%  
Long-term Debt, Total $ 112,000,000 84,000,000
Line of Credit [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] | Maximum [Member]    
Debt Instrument, Spread on Elected Variable Rate 3.50%  
Debt Instrument, Basis Spread on Variable Rate 2.50%  
Mortgages [Member]    
Debt Instrument, Interest Rate, Stated Percentage 4.90%  
Debt Instrument, Periodic Payment, Total $ 35,672  
Long-term Debt, Total $ 3,487,000 $ 3,616,000