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Note 16 - Major Customer (Details Textual) - Customer Concentration Risk [Member] - FedEx Corporation [Member]
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Sales Revenue, Net [Member]    
Concentration Risk, Percentage 47.00% 46.00%
Accounts Receivable [Member]    
Concentration Risk, Percentage 15.00% 24.00%