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Note 8 - Indebtedness - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-term debt $ 25,143  
Current portion (2,857)
Long-term debt, excluding current portion 22,286
Term Loan [Member]    
Long-term debt 17,143  
Revolving Credit Facility [Member]    
Long-term debt $ 8,000