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Note 21 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 02, 2021
Jan. 20, 2020
Oct. 18, 2018
Mar. 31, 2021
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Dec. 31, 2021
Apr. 30, 2018
Loss Contingency, Estimate of Possible Loss       $ 72,000       $ 72,000 $ 4,800      
Proceeds from Legal Settlements               $ 2,700        
Litigation Settlement, Amount Awarded to Other Party   $ 900                    
Litigation Settlement Reimbursable Percentage of Future Losses   60.00%                    
Payments for Legal Settlements         $ 100 $ 100     $ 500      
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount     $ 2,500                  
Escrow Deposit     2,000                  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Total     $ 500                  
Short Term Investments Fair Value Disclosure                     $ 200  
Restricted Cash, Total                   $ 14,492 17,257  
Third Parties [Member]                        
Restricted Cash, Total                   2,800 2,800  
IWS [Member]                        
Restricted Cash, Total                   9,800 $ 12,600  
State and Provincial Regulatory Authorities [Member]                        
Restricted Cash, Total                   $ 1,900    
Loans Payable [Member] | TRT [Member] | Additional Mortgage [Member]                        
Debt Instrument, Face Amount $ 15,000                      
Loans Payable [Member] | TRT [Member] | Additional Mortgage [Member] | DGI-BNSF Corp [Member]                        
Payment for Management Fee             $ 10,600          
Debt Instrument, Percentage of Total Net Proceeds             80.00%          
Loans Payable [Member] | TRT [Member] | Additional Mortgage [Member] | CMC Acquisition LLC [Member]                        
Payment for Management Fee             $ 2,700          
Debt Instrument, Percentage of Total Net Proceeds             20.00%          
Loans Payable [Member] | TRT [Member] | Additional Mortgage [Member] | Third Parties [Member]                        
Payments of Debt Issuance Costs $ 1,100                      
CMC [Member]                        
Noncontrolling Interest, Ownership Percentage by Parent                       81.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                       19.00%
DGI-BNSF Corp [Member]                        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       80.00%       80.00%        
DGI-BNSF Corp [Member] | Maximum [Member]                        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       40.00%       40.00%        
Litigation Settlement, Amount Awarded to Other Party       $ 30,600                
DGI-BNSF Corp [Member] | Minimum [Member]                        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       32.10%       32.10%        
CMC Acquisition LLC [Member]                        
Noncontrolling Interest, Ownership Percentage by Parent       20.00%       20.00%        
Litigation Settlement, Amount Awarded from Other Party       $ 1,500                
CMC Acquisition LLC [Member] | Maximum [Member]                        
Noncontrolling Interest, Ownership Percentage by Parent       48.60%       48.60%        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       11.40%       11.40%        
Proceeds from Legal Settlements       $ 40,000                
CMC Acquisition LLC [Member] | Minimum [Member]                        
Noncontrolling Interest, Ownership Percentage by Parent       55.00%       55.00%        
CRIC TRT Acquisition LLC [Member] | Maximum [Member]                        
Noncontrolling Interest, Ownership Percentage by Parent       12.90%       12.90%        
Litigation Settlement, Amount Awarded to Other Party       $ 9,400