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Note 7 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 25, 2020
Apr. 01, 2019
Feb. 25, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement, Expense       $ 1,145,000 $ 818,000 $ 2,258,000 $ 1,349,000
Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense       28,000 95,000 89,000 240,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       16,900,000   16,900,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       16,500,000   16,500,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       1,600,000 2,000,000.0 $ 4,700,000 $ 3,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)           4 years 1 month 6 days  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       58,000   $ 58,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           1 year 2 months 12 days  
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           0  
Performance Shares [Member] | Management Performance Bonus Plan 2017 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       10,600,000   $ 10,600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 0 $ 0 $ 239,000 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       0 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)           1 year 6 months  
Restricted Stock [Member]              
Share-based Payment Arrangement, Expense       $ 466,000 $ 268,000 $ 860,000 $ 522,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       6,600,000   $ 6,600,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           3 years 2 months 12 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value       1,500,000 3,100,000 $ 548,000 3,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       406,000 369,000 $ 1,200,000 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           235,215  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 12.03  
Restricted Stock [Member] | Executive Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 34,154         34,154  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 9.18         $ 9.18  
Performance-based Restricted Stock [Member]              
Share-based Payment Arrangement, Expense       189,000   $ 378,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       382,000   $ 382,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 82,805         82,805  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 9.18         $ 9.18  
Performance-based Restricted Stock [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards 0.00%            
Performance-based Restricted Stock [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards 125.00%            
Market-based Restricted Stock [Member]              
Share-based Payment Arrangement, Expense       462,000 $ 455,000 $ 931,000 $ 587,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 1,900,000   $ 1,900,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           1 year  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 109,140 29,604 94,247        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 78.00% 69.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0.30% 2.50%          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 2 years 2 years          
Market-based Restricted Stock [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards 0.00% 0.00%          
Market-based Restricted Stock [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards 200.00% 200.00%