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Note 8 - Related Party Transactions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Dec. 31, 2023
Affiliated Entity [Member] | Tmg [Member]        
Related Party Transaction, Purchases from Related Party $ 100 $ 100    
Revenues 0 0    
Accounts Receivable, after Allowance for Credit Loss 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 100 0    
Revenues 0 $ 0    
Accounts Receivable, after Allowance for Credit Loss $ 0     $ 0
Common Stock, Ownership Percentage 7.90%