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Note 4 - Redeemable Noncontrolling Interest (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 01, 2019
May 31, 2021
Feb. 28, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 01, 2016
Payments for Repurchase of Redeemable Noncontrolling Interest       $ 27,164 $ (0) $ (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