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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Jan. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
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, Options, Vested and Expected to Vest, Outstanding, Number   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, Options, Vested and Expected to Vest, Outstanding, Number   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, Options, Vested and Expected to Vest, Outstanding, Number   55,559  
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, Options, Vested and Expected to Vest, Outstanding, Number   72,816  
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, Options, Vested and Expected to Vest, Outstanding, Number   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, Options, Vested and Expected to Vest, Outstanding, Number   72,820  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Four, Vested on January 31, 2016 [Member] | Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 76,442    
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Four, Vested on January 31, 2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 50,102    
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Five, Vesting on January 31, 2017 [Member] | Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   76,442  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Five, Vesting on January 31, 2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   50,100  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Six, Vesting on January 31, 2018 [Member] | Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   76,438  
Restricted Stock [Member] | Employee [Member] | Share-based Compensation Award, Tranche Six, Vesting on January 31, 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   50,106  
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   166,677 229,322
Restricted Stock [Member] | Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   218,452 150,308
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 58,191
Restricted Stock [Member] | Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   218,612 287,513
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   178,223 117,293
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]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   237,500 150,308
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   178,973 197,858
Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   0 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   $ 2.3  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number   274,746 274,746