Note 13 - Equity Transaction and Stock-based Compensation - Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) - $ / shares	12 Months Ended
	Jun. 30, 2015
Range One [Member]
Range of Exercise Price, lower limit (in dollars per share)	$ 0.09
Range of Exercise Price, upper limit (in dollars per share)	$ 0.10
Outstanding (in shares)	2,248,000
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0.09
Weighted Average Remaining Contractual Life	9 years 328 days
Exercisable at June 30, 2014 (in shares)	1,339,600
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0.09
Range Two [Member]
Range of Exercise Price, lower limit (in dollars per share)	0.14
Range of Exercise Price, upper limit (in dollars per share)	$ 0.15
Outstanding (in shares)	475,750
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0.14
Weighted Average Remaining Contractual Life	3 years 182 days
Exercisable at June 30, 2014 (in shares)	475,750
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0.14
Range Three [Member]
Range of Exercise Price, lower limit (in dollars per share)	3.05
Range of Exercise Price, upper limit (in dollars per share)	$ 3.05
Outstanding (in shares)	171,600
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.05
Weighted Average Remaining Contractual Life	2 years 146 days
Exercisable at June 30, 2014 (in shares)	171,600
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.05
Range Four [Member]
Range of Exercise Price, lower limit (in dollars per share)	3.13
Range of Exercise Price, upper limit (in dollars per share)	$ 3.13
Outstanding (in shares)	50,000
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.13
Weighted Average Remaining Contractual Life	146 days
Exercisable at June 30, 2014 (in shares)	50,000
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.13
Range Five [Member]
Range of Exercise Price, lower limit (in dollars per share)	3.36
Range of Exercise Price, upper limit (in dollars per share)	$ 3.36
Outstanding (in shares)	4,500
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.36
Weighted Average Remaining Contractual Life	2 years 146 days
Exercisable at June 30, 2014 (in shares)	4,500
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.40
Range Six [Member]
Range of Exercise Price, lower limit (in dollars per share)	3.86
Range of Exercise Price, upper limit (in dollars per share)	$ 4.10
Outstanding (in shares)	72,000
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.97
Weighted Average Remaining Contractual Life	146 days
Exercisable at June 30, 2014 (in shares)	72,000
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.97
Range Seven [Member]
Range of Exercise Price, lower limit (in dollars per share)	6.80
Range of Exercise Price, upper limit (in dollars per share)	$ 6.80
Outstanding (in shares)	49,600
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 6.80
Weighted Average Remaining Contractual Life	1 year 182 days
Exercisable at June 30, 2014 (in shares)	49,600
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 6.80
Range Eight [Member]
Range of Exercise Price, lower limit (in dollars per share)	7.48
Range of Exercise Price, upper limit (in dollars per share)	$ 7.48
Outstanding (in shares)	1,500
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 7.48
Weighted Average Remaining Contractual Life	1 year 182 days
Exercisable at June 30, 2014 (in shares)	1,500
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 7.48
Range of Exercise Price, lower limit (in dollars per share)	0.09
Range of Exercise Price, upper limit (in dollars per share)	$ 7.48
Outstanding (in shares)	3,072,950
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0.52
Weighted Average Remaining Contractual Life	2 years 292 days
Exercisable at June 30, 2014 (in shares)	2,164,550
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0.70