Note 3 - Stock Option Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Options outstanding (in shares)	225,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.52
Granted to employees and non-employee directors (in shares)	810,000	0
Granted to employees and non-employee directors, weighted average exercise price (in dollars per share)	$ 2.12
Exercised (in shares)
Exercised, weighted average exercise price (in dollars per share)
Canceled/expired/forfeited (in shares)
Canceled/expired/forfeited, weighted average exercise price (in dollars per share)
Options outstanding (in shares)	1,035,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 1.99
Options exercisable (in shares)	65,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 1.43