Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Mar. 31, 2019	Jun. 30, 2018
Accounts receivable, allowance for doubtful accounts	$ 6,719	$ 2,804
Valuation allowance	$ 144,348	$ 133,867
Preferred stock, authorized (in shares)	496,000,000	496,000,000
Preferred stock, issued (in shares)	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	80,000,000	80,000,000
Common stock, outstanding (in shares)	8,087,388	8,077,388
Common stock, issued (in shares)	8,087,388	8,077,388
Convertible Preferred Stock [Member]
Preferred stock, authorized (in shares)	4,000,000	4,000,000
Preferred stock, issued (in shares)	167,100	177,100
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, outstanding (in shares)	167,100	177,100