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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Nov. 30, 2005
Stock Repurchase Program, Number of Shares Authorized to be Repurchased       300,000
Stock Repurchased During Period, Shares 162,486      
Stock Repurchased During Period, Value $ 0 $ 0 $ 0