Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Feb. 28, 2016	May. 31, 2015	[1]
Accounts receivable, allowance for doubtful accounts	$ 366	$ 382
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	27,071,277	26,990,490
Common stock, shares outstanding (in shares)	27,071,277	26,990,490

[1] Derived from audited financial statements.