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Note 4 - Summary of Stock Options (Details)
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Shares outstanding (in shares) | shares 274,500
Shares outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 1.76
Shares outstanding, weighted average remaining contractual life 5 years 109 days
Shares outstanding, aggregate intrinsic value | $ $ 465,390
Shares vested and exercisable (in shares) | shares 254,500
Shares vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 1.72
Shares vested and exercisable, weighted average remaining contractual life 5 years
Shares vested and exercisable, aggregate intrinsic value | $ $ 443,030