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Note 7 - Accounts Receivable - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Account receivable, long-term contracts or programs $ 9,464 $ 9,238
Allowance for doubtful accounts (147) (1,228)
Net 9,317 8,010
Commercial [Member]    
Account receivable, long-term contracts or programs 9,464 9,228
US Government [Member]    
Account receivable, long-term contracts or programs $ 0 $ 10