Note 5 - Employee Stock Compensation Plans (Details) - Exercise Price for Options Outstanding (USD $)	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 0.30
Range of Exercise Prices, Upper Limit	$ 1.71
Options Outstanding (in Shares)	3,944,644	3,488,629
Weighted Average Exercise Prices of Options Outstanding	$ 0.81	$ 0.77
Weighted Average Remaining Contractual Life of Options Outstanding	7 years 146 days
Options Exercisable (in Shares)	1,862,910
Weighted Average Exercise Prices of Options Exercisable	$ 0.79
Weighted Average Remaining Contractual Life of Options Exercisable	5 years 292 days
Price Range $0.30 to 0.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 0.30
Range of Exercise Prices, Upper Limit	$ 0.50
Options Outstanding (in Shares)	157,513
Weighted Average Exercise Prices of Options Outstanding	$ 0.43
Weighted Average Remaining Contractual Life of Options Outstanding	1 year
Options Exercisable (in Shares)	157,513
Weighted Average Exercise Prices of Options Exercisable	$ 0.43
Weighted Average Remaining Contractual Life of Options Exercisable	1 year
Price Range $0.60 to 0.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 0.60
Range of Exercise Prices, Upper Limit	$ 0.71
Options Outstanding (in Shares)	1,720,645
Weighted Average Exercise Prices of Options Outstanding	$ 0.70
Weighted Average Remaining Contractual Life of Options Outstanding	7 years 146 days
Options Exercisable (in Shares)	962,560
Weighted Average Exercise Prices of Options Exercisable	$ 0.69
Weighted Average Remaining Contractual Life of Options Exercisable	7 years 109 days
Price Range $0.76 to 0.94 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 0.76
Range of Exercise Prices, Upper Limit	$ 0.94
Options Outstanding (in Shares)	1,827,989
Weighted Average Exercise Prices of Options Outstanding	$ 0.88
Weighted Average Remaining Contractual Life of Options Outstanding	8 years 6 months
Options Exercisable (in Shares)	504,340
Weighted Average Exercise Prices of Options Exercisable	$ 0.83
Weighted Average Remaining Contractual Life of Options Exercisable	5 years 328 days
Price Range $1.05 to 1.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 1.05
Range of Exercise Prices, Upper Limit	$ 1.71
Options Outstanding (in Shares)	238,497
Weighted Average Exercise Prices of Options Outstanding	$ 1.29
Weighted Average Remaining Contractual Life of Options Outstanding	2 years 146 days
Options Exercisable (in Shares)	238,497
Weighted Average Exercise Prices of Options Exercisable	$ 1.29
Weighted Average Remaining Contractual Life of Options Exercisable	2 years 146 days