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Note 4 - Computation of Net Loss per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net loss	$ (3,539)	$ (4,737)
Denominator:
Weighted-average shares of common stock outstanding (in shares)	21,499	20,999
Weighted-average shares subject to repurchase (in shares)	(985)	(832)
Shares used in per-share calculation - basic (in shares)	20,514	20,167
Shares used in per-share calculation - diluted (in shares)	20,514	20,167
Net loss per share — basic (in dollars per share)	$ (0.17)	$ (0.23)
Net loss per share — diluted (in dollars per share)	$ (0.17)	$ (0.23)

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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