Note 7 - Activity of Stock Option Plan (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Outstanding at December 31, 2015 (in shares) | shares	1,705,500
Outstanding at December 31, 2015, weighted average exercise price (in dollars per share) | $ / shares	$ 2.41
Granted (in shares) | shares
Granted, weighted average exercise price (in dollars per share) | $ / shares
Forfeited or expired (in shares) | shares
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares
Outstanding at March 31, 2016 (in shares) | shares	1,705,500
Outstanding at March 31, 2016, weighted average exercise price (in dollars per share) | $ / shares	$ 2.41
Exercisable at March 31, 2016 (in shares) | shares	915,561
Exercisable at March 31, 2016, weighted average exercise price (in dollars per share) | $ / shares	$ 4.35