Note 8 - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Outstanding (in shares) | shares	760,000
Outstanding (in dollars per share) | $ / shares	$ 2.63
Outstanding (in dollars per share) | $ / shares	$ 1.09
Options granted (in shares) | shares	90,000
Options granted (in dollars per share) | $ / shares	$ 1.83
Options granted (in dollars per share) | $ / shares	$ 0.43
Options cancelled or forfeited (in shares) | shares	(90,000)
Outstanding (in shares) | shares	760,000
Outstanding (in dollars per share) | $ / shares	$ 2.51
Outstanding (in dollars per share) | $ / shares	$ 1
Options Vested (in shares) | shares	632,000
Exercisable at June 30, 2016 (in shares) | shares	268,000