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Note 9 - Share-based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]
6 Months Ended
Sep. 30, 2017
$ / shares
shares
Nonvested restricted stock units at March 31, 2017 (in shares) | shares 25,000
Nonvested restricted stock units at March 31, 2016, weighted average grant price (in dollars per share) | $ / shares $ 3.85
Granted (in shares) | shares 28,074
Granted, weighted average grant price (in dollars per share) | $ / shares $ 3.92
Vested (in shares) | shares
Vested, weighted average grant price (in dollars per share) | $ / shares
Exercised (in shares) | shares
Exercised, weighted average grant price (in dollars per share) | $ / shares
Forfeited (in shares) | shares (2,290)
Forfeited, weighted average grant price (in dollars per share) | $ / shares $ 3.92
Nonvested restricted stock units at September 30, 2017 (in shares) | shares 50,784
Nonvested restricted stock units at March 31, 2017, weighted average grant price (in dollars per share) | $ / shares $ 3.89