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Note 9 - Related Party Transactions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Affiliated Entity [Member] | Tmg [Member]            
Related Party Transaction, Purchases from Related Party $ 37 $ 100 $ 100 $ 200    
Revenues     0 0    
Accounts Receivable, after Allowance for Credit Loss 0   0     $ 0
Affiliated Entity [Member] | Board of Directors Chairman [Member] | Tmg [Member]            
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest         50.00%  
Chart E&C [Member]            
Related Party Transaction, Purchases from Related Party 200 $ 11 300 11    
Revenues     0 $ 0    
Accounts Receivable, after Allowance for Credit Loss $ 0   $ 0     $ 0
Common Stock, Ownership Percentage 7.90%   7.90%      
Accounts Payable $ 300   $ 300