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Note 3 - Acquisition (Details) - Pro Forma Information (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Note 3 - Acquisition (Details) - Pro Forma Information [Line Items]      
Net sales $ 391,237 $ 430,795 $ 473,047
SpeedFC [Member]
     
Note 3 - Acquisition (Details) - Pro Forma Information [Line Items]      
Net sales 97,608 60,794  
Cost of sales 80,364 50,899  
Gross profit 17,244 9,895  
Operating expenses 15,540 16,767  
Income from operations $ 1,704 $ (6,872)