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Note 12 - Indebtedness - Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Long-term debt $ 49,286  
Current portion (2,857)
Long-term debt, excluding current portion 46,429
Term Loan [Member]    
Long-term debt 19,286  
Revolving Credit Facility [Member]    
Long-term debt $ 30,000