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Note 6 - Segment Reporting (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2016
Jul. 01, 2015
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
USD ($)
Sep. 30, 2015
Jun. 30, 2014
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Dec. 31, 2014
Number of Reportable Segments         1       2      
Goodwill, Impairment Loss           $ 4,611         $ 4,611  
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES                        
Concentration Risk, Percentage                   77.00% 85.00% 84.00%
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES                        
Concentration Risk, Percentage                   87.00% 93.00%  
Term Loan [Member]                        
Debt Instrument, Interest Rate, Increase (Decrease)       0.25%     0.25% (0.25%)     0.25% 0.25%
Net Debt Leverage Ratio Not Achieved 3 3 3 3   3 3 3   3 3 3
Ottomotores [Member]                        
Goodwill, Impairment Loss                     $ (4,611)  
Trade Names [Member]                        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)           $ 36,076         $ (36,076)