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Note 2 - Accounts Receivable (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Allowance for Doubtful Accounts Receivable, Current $ 2,900,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,200,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent  
Provision for Doubtful Accounts $ 467,000us-gaap_ProvisionForDoubtfulAccounts $ 83,000us-gaap_ProvisionForDoubtfulAccounts $ 322,000us-gaap_ProvisionForDoubtfulAccounts