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Note 5 - Accounts Receivable (Details) - Accounts Receivable Detail (USD $)
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable Types $ 38,865,000 $ 38,840,000
38,865,000 38,840,000
Allowance for doubtful accounts (332,000) (310,000)
38,533,000 38,530,000
Commercial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable Types 36,245,000 38,220,000
36,245,000 38,220,000
US Government [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable Types 2,620,000 620,000
$ 2,620,000 $ 620,000