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Note 6 - Revenue - Contract Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accounts receivable, net $ 329,711 $ 330,817
Deferred revenue 11,330 17,038
Billed Revenues [Member]    
Accounts receivable, net 223,041 236,158
Unbilled Revenues [Member]    
Accounts receivable, net $ 106,670 $ 94,659