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Note 7 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Feb. 01, 2019
Jan. 02, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total       $ 4.2    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 182 days    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       391,836 307,943 237,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 14.63 $ 10.40 $ 12.88
Restricted Stock [Member] | Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       318,196 307,943 218,452
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 15.25    
Restricted Stock [Member] | Employee [Member] | Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 336,609 340,993        
Stock Granted, Value, Share-based Compensation, Net of Forfeitures, Total $ 5.6 $ 5.1        
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       131,106    
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       69,651    
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       69,652    
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche One, Vesting January 31, 2018 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         102,648  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vesting January 31, 2019 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         102,648 72,820
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting January 31, 2020 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         102,647  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche One, Vesting January 31, 2017 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           72,816
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting January 31, 2019 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           72,820
Restricted Stock [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       73,640 76,856 19,048
Restricted Stock [Member] | Common Class A [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       220,080 275,076 218,612
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 12.65 $ 10.84 $ 11.25
Restricted Stock [Member] | Common Class A [Member] | Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         198,220 166,677
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 199,810          
Stock Granted, Value, Share-based Compensation, Net of Forfeitures, Total $ 3.1          
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche One, Vesting January 31, 2018 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         66,073  
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vesting January 31, 2019 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         66,073  
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting January 31, 2020 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         66,074  
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche One, Vesting January 31, 2017 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           55,559
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting January 31, 2019 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           55,559
Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vesting January 31, 2018 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           55,559
Restricted Stock [Member] | Common Class A [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           51,935
Service Based Restricted Stock [Member] | Common Class A [Member] | Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       110,040    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 12.65    
Service Based Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       36,680    
Service Based Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       36,680    
Service Based Restricted Stock [Member] | Common Class A [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     36,680      
Performance Based Restricted Stock [Member] | Common Class A [Member] | Employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       110,040    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 12.65    
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       215,500 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 15.70 $ 0
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche One, Vesting January 31, 2018 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         209,500  
Directors Restricted Stock Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award Maximum Number of Restricted Shares Authorized Yearly Per Director       10,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       770,000    
Directors Restricted Stock Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0 0 0
The 2017 Equity and Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       4,400,000    
The 2017 Equity and Incentive Compensation Plan [Member] | Common Class A [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       1,700,000    
2007 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       274,746 274,746  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 1.99 $ 1.99  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 3.5