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Note 10 - Credit Agreements - Short-term Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Short-term borrowings $ 31,414 $ 20,602
ABL Revolving Credit Facility [Member]    
Short-term borrowings 0 0
Other Lines of Credit [Member]    
Short-term borrowings $ 31,414 $ 20,602