Note 12 - Stockholders' Equity - Summary of Option Activity (Details) - Incentive Share Option Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance, Amount of Options (in shares)	1,146,000	1,262,763
Balance, Weighted Average Exercise Price (in dollars per share)	$ 1.52	$ 1.57
Balance, Weighted Average remaining Contractual Term (Year)	9 years 29 days	6 years 270 days	7 years 237 days
Granted, Amount of Options (in shares)	1,800,000	155,000
Granted, Weighted Average Exercise Price (in dollars per share)	$ 0.67	$ 0.67
Forfeited, Amount of Options (in shares)	(650,000)	(261,000)
Forfeited, Weighted Average Exercise Price (in dollars per share)	$ 1.59	$ 1.29
Expired, Amount of Options (in shares)	(40,000)	(10,763)
Expired, Weighted Average Exercise Price (in dollars per share)	$ 1.16	$ 0.70
Balance, Amount of Options (in shares)	2,256,000	1,146,000	1,262,763
Balance, Weighted Average Exercise Price (in dollars per share)	$ 0.83	$ 1.52	$ 1.57
Balance, Aggregate Intrinsic Value
Exercisable, Amount of Options (in shares)	1,327,667
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.89
Exercisable, Weighted Average remaining Contractual Term (Year)	8 years 233 days
Exercisable, Aggregate Intrinsic Value