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Note 3 - Class A Convertible Preferred Units and Warrants (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Mar. 02, 2017
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Aug. 31, 2023
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
May 31, 2023
USD ($)
shares
Feb. 28, 2023
USD ($)
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 18, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
$ / shares
shares
Temporary Equity, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 1,000         $ 1,000   $ 1,000  
Preferred Units, Number of Redeemed Units (in shares)   (15,001) (35,000) (45,000) (35,834) (47,499) (178,334)      
Warrants and Rights Outstanding | $   $ 32,843         $ 32,843   $ 47,964  
Class of Warrant or Right, Outstanding (in shares)   2,190,000         2,190,000   3,002,500  
Warrants at 22.81 Strike Price [Member]                    
Class of Warrant or Right Warrants, Issued (in shares) 1,750,000                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 22.81                  
Warrants at 22.81 Strike Price [Member] | Warrant Holder [Member]                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 22.81         $ 22.81 $ 22.81 $ 22.81 $ 22.81
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   0         0 752,500 750,000 750,000
Warrants at 34.00 Strike Price [Member]                    
Class of Warrant or Right Warrants, Issued (in shares) 2,250,000                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 34                  
Warrants at 34.00 Strike Price [Member] | Warrant Holder [Member]                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 34         $ 34 $ 34 $ 34 $ 34
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   2,190,000         2,190,000 60,000 2,250,000 2,250,000
Warrants and Rights Outstanding | $               $ 33,600    
Warrants to Purchase Common Units [Member]                    
Class of Warrant or Right, Outstanding (in shares)                 3,000,000  
Warrants to Purchase Common Units [Member] | Warrant Holders’ Interest [Member]                    
Warrants and Rights Outstanding | $   $ 32,800         $ 32,800   $ 48,000  
Class A Convertible Preferred Units [Member]                    
Preferred Units, Issued (in shares) 250,000                  
Temporary Equity, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 1,000                  
Preferred Units Origination Fee Percent 2.50%                  
Preferred Stock, Dividend Rate, Percentage 12.00%                  
Convertible Preferred Units Maximum Redeemed Units Percent 33.00%                  
Convertible Preferred Units, Redemption Price, Minimum (in dollars per share) | $ / shares $ 51                  
Debt Instrument Covenants Consolidated Leverage Ratio Minimum 3.25                  
Debt Instrument Covenants Distributable Cash Flow Ratio Maximum 1.2                  
Partners' Capital, Distribution Amount Per Share (in dollars per share) | $ / shares $ 0.45                  
Preferred Units Preferred Purchaser Approval Rights Ownership Threshold 20.00%                  
Preferred Units, Number of Redeemed Units (in shares)   (15,001) (35,000) (45,000) (35,834) (47,499)        
Preferred Units, Value of Redeemed Units | $   $ 15,000 $ 35,000 $ 45,000 $ 35,800 $ 47,500        
Preferred Units, Outstanding (in shares)   71,666         71,666      
Class A Convertible Preferred Units [Member] | Debt Instrument, Redemption, Period One [Member]                    
Convertible Preferred Units Conversion to Common Units Discount Percentage 7.50%                  
Convertible Preferred Units Purchase Price Multiplier 1.5                  
Class A Convertible Preferred Units [Member] | Debt Instrument, Redemption, Period Three [Member]                    
Convertible Preferred Units Conversion to Common Units Discount Percentage 10.00%                  
Convertible Preferred Units Purchase Price Multiplier 1.85                  
Class A Convertible Preferred Units [Member] | Debt Instrument, Redemption, Period Two [Member]                    
Convertible Preferred Units Purchase Price Multiplier 1.7                  
Preferred Stock [Member]                    
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants, Total | $ $ 250,000