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Note 2 - Allowance for Doubtful Accounts Receivable (Details) - Allowance for Doubtful Accounts Receivable (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Abstract]    
Balance at the beginning of year $ 560,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 725,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provision for bad debts 197,000us-gaap_ProvisionForDoubtfulAccounts 161,000us-gaap_ProvisionForDoubtfulAccounts
Charge-offs (105,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (337,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Recoveries 28,000us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 11,000us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Balance at the end of year $ 680,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 560,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent