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Note 9 - Term Loan and Line of Credit Agreements - Summary of Term Loan and Line of Credit Agreements (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Long-term debt, gross $ 11,325  
Less current portion of long-term debt, gross 573 $ 566
Less current portion debt issuance costs (19) (19)
Current portion of long-term debt 554 547
Long-term debt, gross, net of current portion 10,752 10,898
Debt issuance costs, net of current portion (148) (153)
Long-term debt, net of current portion 10,604 10,745
Term Loan Agreement [Member]    
Long-term debt, gross 11,325 11,464
Debt issuance costs (167) (172)
Long-term debt $ 11,158 $ 11,292