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Note 7 - Term Loan and Line of Credit Agreements - Summary of Term Loan and Line of Credit Agreements (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Long-term debt, gross $ 11,869,000  
Less current portion of long-term debt, gross (544,000) $ (536,000)
Less current portion debt issuance costs 19,000 19,000
Less current portion of long-term debt (525,000) (517,000)
Long-term debt, gross, net of current portion 11,325,000 11,464,000
Debt issuance costs, net of current portion (165,000) (170,000)
Long-term debt, net of current portion 11,160,000 11,294,000
Term Loan Agreement [Member]    
Long-term debt, gross 11,869,000 12,000,000
Debt issuance costs (184,000) (189,000)
Long-term debt $ 11,685,000 $ 11,811,000