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Note 6 - Segment Reporting (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Number of Reportable Segments     2    
Goodwill, Impairment Loss $ 4,611        
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES          
Concentration Risk, Percentage     74.00% 77.00% 85.00%
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES          
Concentration Risk, Percentage     85.00% 87.00%  
Term Loan [Member]          
Debt Instrument, Interest Rate, Increase (Decrease)   0.25%   0.25% 0.25%
Net Debt Leverage Ratio Not Achieved       3 3
Ottomotores [Member]          
Goodwill, Impairment Loss         $ (4,611)
Trade Names [Member]          
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 36,076       $ (36,076)