Note 10 - Stock Options - Summary of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Outstanding, Shares (in shares)	3,485,168	3,500,168
Outstanding, weighted average exercise price (in dollars per share)	$ 1.31	$ 0.90
Outstanding, weighted average remaining contractual term (Year)	2 years 310 days	2 years 193 days	2 years 7 days
Outstanding, aggregate intrinsic value	$ 46,233	$ 63,067	$ 2,785,893
Granted, Shares (in shares)	3,525,000	1,123,500
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.78	$ 1.75
Exercised, Shares (in shares)	0	(1,125,000)
Exercised, Weighted Average Exercise Price (in dollars per share)		$ 0.48
Forfeited or Expired, Shares (in shares)	(2,799,000)	(13,500)
Forfeited or Expired, Weighted Average Exercise Price (in dollars per share)	$ 0.96	$ 2.06
Outstanding, Shares (in shares)	4,211,168	3,485,168	3,500,168
Outstanding, weighted average exercise price (in dollars per share)	$ 1.09	$ 1.31	$ 0.90
Vested or Expected to Vest, Shares (in shares)	2,551,334
Vested or Expected to Vest at December 31, 2016 (in dollars per share)	$ 1.09
Vested or Expected to Vest at December 31, 2016 (Year)	2 years 76 days
Vested or Expected to Vest at December 31, 2016	$ 26,333
Exercisable, Shares (in shares)	2,551,334
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1.09
Exercisable, weighted average remaining contractual term (Year)	2 years 76 days
Exercisable, aggregate intrinsic value	$ 26,333