Note 6 - Summary of Expired Director Plans (Details) - Jun. 30, 2015 - $ / shares	Total
Exercise Price Range 1 [Member]
Range of exercise price, lower limit (in dollars per share)	$ 2.925
Range of exercise price, upper limit (in dollars per share)	$ 5.25
Outstanding stock options (in shares)	13,000
Outstanding, weighted average share price (in dollars per share) (in dollars per share)	$ 3.28
Weighted average remaining life	5 years 36 days
Number of stock options exercisable (in shares)	13,000
Exercisable, weighted average share price (in dollars per share)	$ 3.28
Exercise Price Range 2 [Member]
Range of exercise price, lower limit (in dollars per share)	$ 6
Range of exercise price, upper limit (in dollars per share)
Outstanding stock options (in shares)	3,000
Outstanding, weighted average share price (in dollars per share) (in dollars per share)	$ 6
Weighted average remaining life	4 years 292 days
Number of stock options exercisable (in shares)	3,000
Exercisable, weighted average share price (in dollars per share)	$ 6
Exercise Price Range 3 [Member]
Range of exercise price, lower limit (in dollars per share)	10.50
Range of exercise price, upper limit (in dollars per share)	$ 11
Outstanding stock options (in shares)	4,000
Outstanding, weighted average share price (in dollars per share) (in dollars per share)	$ 10.75
Weighted average remaining life	2 years 109 days
Number of stock options exercisable (in shares)	4,000
Exercisable, weighted average share price (in dollars per share)	$ 10.75
Outstanding stock options (in shares)	20,000
Outstanding, weighted average share price (in dollars per share) (in dollars per share)	$ 5.18
Weighted average remaining life
Number of stock options exercisable (in shares)	20,000
Exercisable, weighted average share price (in dollars per share)	$ 5.18