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Note 5 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 4 Months Ended
Feb. 03, 2018
Mar. 31, 2017
May 05, 2018
Apr. 29, 2017
May 05, 2018
May 11, 2017
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 255 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0       213,687 [1]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0       2,484 [1]  
Minimum [Member]            
Performance-based Shares, Payout Opportunity, Percentage   25.00%        
Maximum [Member]            
Performance-based Shares, Payout Opportunity, Percentage   200.00%        
Options and Restricted Stock [Member]            
Allocated Share-based Compensation Expense, Total     $ 0.8 $ 1.2    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total     5.0   $ 5.0  
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 3,479       148,319 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 9.25       $ 8.61 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 129       132,076 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 11.65       $ 12.25 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 7,477       7,693 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 10.70       $ 10.72 [2]  
Time-based and Performance-based Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 1.7 $ 1.5    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [2]         83.256  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value [2]         $ 8.60  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period [2]         6,323  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value [2]         $ 20.58  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period [2]         1,280  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value [2]         $ 13.69  
Performance Shares [Member] | Vesting at End of Three-year Performance Period [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period   3 years        
The 2017 Omnibus Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           1,000,000
[1] No options were granted or exercised for the five weeks ended February 3, 2018.
[2] Restricted stock for the five weeks ended February 3, 2018 included the following activity: granted 3,479 shares with a weighted average grant date fair value of $9.25, vested 129 shares with a weighted average grant date fair value of $11.65 and forfeited 7,477 shares with a weighted average grant date fair value of $10.70. No performance shares activity occurred for the five weeks ended February 3, 2018.