Note 3 - Stock-Based Compensation - Stock Option Activity (Details) - Jun. 30, 2015 - $ / shares	Total
Options outstanding (in shares)	580,000
Options outstanding (in dollars per share)	$ 1.58
Exercised (in shares)	(445,000)
Options outstanding (in shares)	135,000
Options outstanding (in dollars per share)	$ 1.48
Options exercisable, June 30, 2015 (in shares)	55,000
Options exercisable, June 30, 2015 (in dollars per share)	$ 1.44