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Note 12 - Indebtedness - Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Long-term debt $ 22,143   $ 25,143
Current portion (2,857) $ (2,857) (2,857)
Long-term debt, excluding current portion 19,286 $ 22,286 22,286
Term Loan [Member]      
Long-term debt 17,143   17,143
Revolving Credit Facility [Member]      
Long-term debt $ 5,000   $ 8,000