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Note 3 - Class A Convertible Preferred Units and Warrants - Preferred Units Activity (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Aug. 31, 2023
Jun. 30, 2023
May 31, 2023
Feb. 28, 2023
Feb. 28, 2022
Sep. 30, 2023
Dec. 31, 2022
Beginning balance, units outstanding (in shares)             250,000  
Beginning balance, financial position             $ 164,587  
Redemption of preferred units paid-in-kind, units outstanding (in shares)           (19,321)    
Redemption of preferred units, units outstanding (in shares) (15,001) (35,000) (45,000) (35,834) (47,499)   (178,334)  
Redemption of preferred units, financial position             $ (117,406)  
Ending balance, units outstanding (in shares) 71,666           71,666 250,000
Ending balance, financial position $ 47,181           $ 47,181 $ 164,587
Preferred Partner [Member] | Preferred Stock [Member]                
Beginning balance, units outstanding (in shares)             250,000 269,321
Beginning balance, financial position             $ 164,587 $ 183,908
Redemption of preferred units paid-in-kind, units outstanding (in shares)               (19,321)
Redemption of preferred units paid-in-kind, financial position               $ (19,321)
Ending balance, units outstanding (in shares) 71,666           71,666 250,000
Ending balance, financial position $ 47,181           $ 47,181 $ 164,587