Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Accounts receivable, allowance	$ 99	$ 72
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	3,000	3,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	20,000	20,000
Common stock, sahres issued (in shares)	9,238	9,153
Common stock, shares outstanding (in shares)	9,238	9,153