Note 10 - Stock Options - Summary of Stock Option Activity (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Outstanding, Shares (in shares)	3,485,168
Outstanding, weighted average exercise price (in dollars per share)	$ 1.31
Outstanding, weighted average remaining contractual term	3 years 43 days		2 years 193 days
Outstanding, aggregate intrinsic value	$ 54,100		$ 63,067
Granted, Shares (in shares)	3,525,000	1,123,500
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.78
Forfeited or Expired, Shares (in shares)	(2,699,500)
Forfeited or Expired, Weighted Average Exercise Price (in dollars per share)	$ 0.93
Outstanding, Shares (in shares)	4,310,668		3,485,168
Outstanding, weighted average exercise price (in dollars per share)	$ 1.11		$ 1.31
Vested or Expected to Vest, Shares (in shares)	4,310,668
Vested or Expected to Vest at September 30, 2016 (in dollars per share)	$ 1.11
Vested or Expected to Vest at September 30, 2016	3 years 43 days
Vested or Expected to Vest at September 30, 2016	$ 54,100
Exercisable, Shares (in shares)	2,042,832
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 1.23
Exercisable, weighted average remaining contractual term	1 year 335 days
Exercisable, aggregate intrinsic value	$ 31,600