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Note 3 - Redeemable Noncontrolling Interest (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Feb. 01, 2019
May 31, 2021
Feb. 28, 2019
Sep. 30, 2021
Sep. 30, 2020
Mar. 01, 2016
Payments for Repurchase of Redeemable Noncontrolling Interest       $ 27,164 $ (0)  
Pramac [Member]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   20.00%       35.00%
Captiva Energy Solutions [Member]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 49.00%          
Pramac [Member]            
Business Acquisition, Percentage of Voting Interests Acquired   15.00%       65.00%
Redeemable Noncontrolling Interest, Equity, Fair Value, Total           $ 34,253
Noncontrolling Interest Agreement, Extension of Term (Year)   3 years 5 years      
Payments for Repurchase of Redeemable Noncontrolling Interest   $ 27,164        
Business Combination, Step Acquisition, Equity Interest in Acquiree, including Subsequent Acquisition, Percentage, Total   80.00%        
Captiva Energy Solutions [Member]            
Business Acquisition, Percentage of Voting Interests Acquired 51.00%          
Redeemable Noncontrolling Interest, Equity, Fair Value, Total $ 3,165          
Business Acquisition, Noncontrolling Interest, Term of Put Option (Year) 5 years          
Business Acquisition, Term of Call Option (Year) 5 years