Note 2 - Stockholders' Equity (Tables)

3 Months Ended

Sep. 30, 2015

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three months ended
	September 30 ,
	201 5			201 4
Risk-free interest rate	0.71%	-	1.50%	1.59%	-	1.65%
Dividend yield		—			—
Weighted-average expected term (in years)	4.24	-	4.31	4.83	-	4.86
Expected volatility	64.8%	-	65.8%	71.0%	-	72.1%

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three months ended
	September 30 ,
	201 5		201 4
Cost of product sales	$	18	$	30
Research and development		41		63
Selling, general and administrative		76		220
Total	$	135	$	313