Note 12 - Stock Option and Restricted Stock Awards (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Restricted Stock [Member]
Equity awards outstanding at December 31, 2015 (in shares)	81,518	81,518
Equity awards outstanding at December 31, 2015 (in dollars per share)	$ 2.64	$ 2.64
Equity awards granted (in shares)	94,500
Equity awards granted (in dollars per share)	$ 1.33
Equity awards exercised (in shares)	(94,500)
Equity awards exercised (in dollars per share)	$ 1.33
Aggregate intrinsic value of outstanding awards at March 31, 2016	$ 119,016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,651,639	2,139,822
Equity awards outstanding at December 31, 2015 (in dollars per share)	$ 4.64	$ 5.64
Equity awards granted (in shares)	551,250
Equity awards granted (in dollars per share)	$ 1.33
Equity awards forfeited, cancelled or expired (in shares)	(39,433)
Equity awards forfeited, cancelled or expired (in dollars per share)	$ 12.24
Equity awards outstanding at March 31, 2016	7 years 255 days
Aggregate intrinsic value of outstanding awards at March 31, 2016	$ 71,662
Equity awards exercisable at March 31, 2016 (in shares)	1,704,188
Equity awards exercisable at March 31, 2016 (in dollars per share)	$ 5.63
Equity awards exercisable at March 31, 2016	7 years
Aggregate intrinsic value of awards exercisable at March 31, 2016	$ 23,888