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Note 9 - Stock-based Compensation (Details) - Summary of Option Activity (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Summary of Option Activity [Abstract]        
Outstanding Number of Shares 416,125 433,785   443,642
Outstanding Weighted-Avg. Exercise Price $ 29.87 $ 22.77   $ 20.10
Outstanding Weighted-Avg. Remaining Contractual Term 4 years 146 days 3 years 255 days 3 years 328 days 4 years
Outstanding Aggregate Intrinsic Value $ 9,529 $ 11,516   $ 3,861
Exercisable Number of Shares 140,825 158,320 148,910  
Exercisable Weighted-Avg. Exercise Price $ 26.70 $ 21.00 $ 19.28  
Exercisable Remaining Contractual Term 3 years 6 months 3 years 3 years 73 days  
Exercisable Aggregate Intrinsic Value 8,949 5,031 4,473  
Granted Number of Shares 128,124 116,080 103,780  
Granted Weighted-Avg. Exercise Price $ 55.33 $ 49.97 $ 29.87  
Granted Weighted-Avg. Remaining Contractual Term 6 years 146 days 5 years 328 days 5 years 146 days  
Forfeited Number of Shares (27,782) (40,375) (11,940)  
Forfeited Weighted-Avg. Exercise Price $ 52.50 $ 32.87 $ 26.06  
Expired Number of Shares (410) (40) (1,020)  
Expired Weighted-Avg. Exercise Price $ 52.50 $ 18.98 $ 14.50  
Exercised Number of Shares (117,885) (93,325) (100,677)  
Exercised Weighted-Avg. Exercise Price $ 22.17 $ 20.56 $ 18.00  
Outstanding Number of Shares 398,172 416,125 433,785  
Outstanding Weighted-Avg. Exercise Price $ 38.75 $ 29.87 $ 22.77  
Outstanding Weighted-Avg. Remaining Contractual Term 4 years 146 days 3 years 255 days 3 years 328 days 4 years
Outstanding Aggregate Intrinsic Value $ 20,505 $ 9,529 $ 11,516