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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Allowance for sales discounts and doubtful accounts $ (1,100) $ (1,100)
Accounts receivable, net 57,459 50,762
Billed Revenues [Member]    
Accounts receivable, current 37,632 40,256
Unbilled Revenues [Member]    
Accounts receivable, current 15,769 6,615
Work In Progress [Member]    
Accounts receivable, current $ 5,158 $ 4,991