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Note 5 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 87,500  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 8.75  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 900,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 0  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 200,000 242,000
Allocated Share-based Compensation Expense $ 600,000 $ 1,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 5,800,000  
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 329,000  
Allocated Share-based Compensation Expense $ 500,000 300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 9,700,000  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Shares Issued During Exercise of Instrument, Upper Limit, Percentage 200.00%  
Performance Shares [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Performance Shares [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Employee Stock Option [Member]    
Allocated Share-based Compensation Expense $ 0 $ 0