Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Accounts receivable, allowance for doubtful accounts	$ 98	$ 114
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	35,000	35,000
Common stock, shares issued (in shares)	14,950	12,223
Common stock, shares outstanding (in shares)	14,805	12,078
Treasury stock, shares (in shares)	145	145