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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 14, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 3.4    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 146 days    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   307,943 237,500 150,308
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 10.40 $ 12.88 $ 10.27
Restricted Stock [Member] | Subsequent Event [Member]        
Stock Granted, Value, Share-based Compensation, Net of Forfeitures $ 7.6      
Restricted Stock [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   275,076 218,612 287,513
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 10.84 $ 11.25 $ 9.37
Restricted Stock [Member] | Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   307,943 218,452 150,308
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 318,196      
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] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   198,220 166,677 229,322
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 One, Vesting January 31, 2018 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   66,073    
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    
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vesting January 31, 2019 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   66,073    
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 Three, Vesting January 31, 2020 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   66,074    
Restricted Stock [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     72,816  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vesting January 31, 2018 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     55,559  
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 One, Vesting January 31, 2017 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     55,559  
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] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting January 31, 2019 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     55,559  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche One, Vested on January 31, 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       50,102
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche One, Vested on January 31, 2016 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       76,442
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vesting on January 31, 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       50,100
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting on January 31, 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       50,106
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three, Vesting on January 31, 2018 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       76,438
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche One [Member] | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 153,406      
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two [Member] | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 82,394      
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Three [Member] | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 82,396      
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Two, Vested on January 31, 2017 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       76,442
Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     19,048  
Restricted Stock [Member] | Director [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     51,935 58,191
Restricted Stock [Member] | Director [Member] | Share-based Compensation Award, Tranche Two, Vesting January 31, 2018 [Member] | Common Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   76,856    
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 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 $ 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    
Service Based Restricted Stock [Member] | Employee [Member] | Common Class A [Member] | Subsequent Event [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] | Employee [Member] | Share-based Compensation Award, Tranche One [Member] | Common Class A [Member] | Subsequent Event [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] | Employee [Member] | Share-based Compensation Award, Tranche Two [Member] | Common Class A [Member] | Subsequent Event [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] | Employee [Member] | Share-based Compensation Award, Tranche Three [Member] | Common Class A [Member] | Subsequent Event [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] | Employee [Member] | Common Class A [Member] | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 110,040      
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   4,800,000    
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   1,900,000    
2007 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   274,746 274,746  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 1.99 $ 1.99  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 4.1