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Note 6 - Segment Reporting (Details Textual)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2016
Jul. 01, 2015
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Term Loan [Member]                        
Debt Instrument, Interest Rate, Increase (Decrease)     0.25%     0.25%       0.25% 0.25%  
Net Debt Leverage Ratio Not Achieved 3 3 3   3 3   3 3      
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES                        
Concentration Risk, Percentage     77.00%     88.00%       78.00% 86.00%  
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES                        
Concentration Risk, Percentage                   86.00%   93.00%
Number of Reportable Segments       1     2