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Note 3 - Term Loan and Line of Credit Agreements - Summary of Term Loan and Line of Credit Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Long-term debt, gross $ 11,464  
Less current portion of long-term debt, gross 566 $ 536
Less current portion debt issuance costs (19) (19)
Current portion of long-term debt 547 517
Long-term debt, gross, net of current portion 10,898 11,464
Debt issuance costs, net of current portion (153) (170)
Long-term debt, net of current portion 10,745 11,294
Term Loan Agreement [Member]    
Long-term debt, gross 11,464 12,000
Debt issuance costs (172) (189)
Long-term debt $ 11,292 $ 11,811