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Note 16 - Subsequent Events (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 25, 2023
USD ($)
May 25, 2023
USD ($)
Feb. 24, 2023
USD ($)
May 25, 2022
USD ($)
Feb. 25, 2022
USD ($)
Aug. 31, 2023
USD ($)
Aug. 08, 2023
USD ($)
Jul. 31, 2023
$ / shares
$ / bbl
shares
Jul. 31, 2023
USD ($)
$ / shares
$ / bbl
Jul. 31, 2023
$ / shares
$ / bbl
Jul. 31, 2023
$ / shares
$ / bbl
MMBbls
Jul. 31, 2023
$ / shares
$ / bbl
bbl
May 31, 2023
USD ($)
Apr. 30, 2023
$ / shares
Feb. 28, 2023
USD ($)
Jan. 31, 2023
$ / shares
May 31, 2022
USD ($)
Apr. 30, 2022
$ / shares
Feb. 28, 2022
USD ($)
Jan. 31, 2022
$ / shares
Jun. 30, 2023
$ / shares
Mar. 31, 2023
$ / shares
Jun. 30, 2022
$ / shares
Mar. 31, 2022
$ / shares
Jun. 30, 2023
USD ($)
$ / shares
MMBbls
Jun. 30, 2022
USD ($)
$ / shares
Common Stock, Dividends, Per Share, Declared | $ / shares                                         $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.05 $ 0.05
Dividends Payable                         $ 53,000   $ 53,000   $ 53,000   $ 53,000              
Proceeds from Issuance of Common Stock                                                 $ (748,000) $ (58,000)
Deferred Premium Put Options Q3 2024 [Member] | Not Designated as Hedging Instrument [Member]                                                    
Derivative, Nonmonetary Notional Amount, Volume | MMBbls                                                 920.0  
Forecast [Member]                                                    
Dividends $ 3,200,000                                                  
Dividends Payable           $ 54,000                                        
Subsequent Event [Member] | Public Stock Offering [Member]                                                    
Stock Issued During Period, Shares, New Issues | shares               14,835,000                                    
Shares Issued, Price Per Share | $ / shares               $ 10.50 $ 10.50 $ 10.50 $ 10.50 $ 10.50                            
Proceeds from Issuance of Common Stock                 $ 151,200,000                                  
Subsequent Event [Member] | Public Stock Offering [Member] | Existing Stockholders [Member]                                                    
Stock Issued During Period, Shares, New Issues | shares               10,000,000                                    
Subsequent Event [Member] | Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member]                                                    
Debt Instrument, Restriction on Borrowings, Minimum Net Proceeds From Equity Securities             $ 95,000,000                                      
Subsequent Event [Member] | Deferred Premium Put Options Q3 2024 [Member] | Not Designated as Hedging Instrument [Member]                                                    
Derivative, Nonmonetary Notional Amount, Volume                     920.0 8,000                            
Subsequent Event [Member] | Deferred Premium Put Options Q3 2024 [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]                                                    
Derivative, Floor Price (in USD per Barrel of Oil) | $ / bbl               74.46 74.46 74.46 74.46 74.46                            
Quarterly Dividend [Member]                                                    
Common Stock, Dividends, Per Share, Declared | $ / shares                           $ 0.025   $ 0.025   $ 0.025   $ 0.025            
Dividends   $ 2,800,000 $ 2,800,000 $ 2,600,000 $ 2,400,000                                          
Quarterly Dividend [Member] | Subsequent Event [Member]                                                    
Common Stock, Dividends, Per Share, Declared | $ / shares                   $ 0.025                                
Dividend Equivalent [Member]                                                    
Dividends                         282,000   283,000   214,000   214,000              
Dividends Payable                         $ 5,000   $ 5,000   $ 2,000   $ 2,000              
Dividend Equivalent [Member] | Forecast [Member]                                                    
Dividends           331,000                                        
Dividends Payable           $ 5,000