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Note 15 - Income Taxes (Details Textual)
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Effective Income Tax Rate Reconciliation, Percent 39.00% 38.20%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Effective Income Tax Rate Reconciliation, Percent 41.60% 41.60%
Foreign Tax Authority [Member] | Canada [Member]    
Effective Income Tax Rate Reconciliation, Percent 26.50% 26.50%