Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Accounts receivable, allowance for doubtful accounts	$ 274,000	$ 102,000	$ 49,000
Inventories, reserves	$ 1,069,000	$ 1,230,000	$ 1,437,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0	0
Preferred stock, shares outstanding (in shares)	0	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	350,000,000	350,000,000	350,000,000
Common stock, shares issued (in shares)	10,872,428	9,915,868	3,010,687
Common stock, shares outstanding (in shares)	10,872,428	9,915,868	3,010,687