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Note 16 - Stock-based Compensation Plans (Details) - Summary of Option Activity - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Summary of Option Activity [Abstract]    
Number of Stock Options Outstanding 953,264 1,139,853
Weighted-Average Exercise Price $ 6.33 $ 4.39
Weighted-Average Remaining Contractual Life (years) 3 years 6 months 2 years 6 months
Aggregate Intrinsic Value $ 10.6  
Vested or expected to vest at January 31, 2016 450,589  
Vested or expected to vest at January 31, 2016 $ 8.18  
Vested or expected to vest at January 31, 2016 3 years 6 months  
Vested or expected to vest at January 31, 2016 $ 5.0  
Exercisable at January 31, 2016 292,811  
Exercisable at January 31, 2016 $ 6.54  
Exercisable at January 31, 2016 2 years 219 days  
Exercisable at January 31, 2016 $ 3.7  
Granted   215,000
Granted   $ 13.77
Exercised (37,500) (220,138)
Exercised $ 4.18 $ 3.49
Surrendered for Shares (446,875) (175,000)
Surrendered for Shares $ 2.59 $ 4.53
Forfeited   (6,451)
Forfeited   $ 5.72
Number of Stock Options Outstanding 468,889 953,264
Weighted-Average Exercise Price $ 8.25 $ 6.33
Aggregate Intrinsic Value $ 5.2 $ 10.6