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Note 6 - Accounts Receivable Detail (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Commercial [Member]    
Account Receivable Types $ 11,882,000 $ 47,228,000
US Government [Member]    
Account Receivable Types 1,454,000 727,000
Account Receivable Types 13,336,000 47,955,000
Allowance for doubtful accounts (942,000) (289,000)
$ 12,394,000 $ 47,666,000