Note 12 - Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

Schedule of Share-based Compensation Stock Options and Restricted Stock Awards Activity [Table Text Block]

	Stock Options					Restricted Stock Awards					Weighted Average
Equity Awards	Options Outstanding			Weighted Average Exercise Price		Non-vested Restricted Stock Outstanding			Weighted Average Grant Date Fair Value		Contractual Terms of Equity Awards (in years)
Equity awards outstanding at December 31, 2015		2,139,822		$	5.64		81,518		$	2.64
Equity awards granted		551,250		$	1.33		94,500		$	1.33
Equity awards exercised		–			–		(94,500	)	$	1.33
Equity awards forfeited, cancelled or expired		(39,433	)	$	12.24		–			–
Equity awards outstanding at March 31, 2016		2,651,639		$	4.64		81,518		$	2.64		7.7
Aggregate intrinsic value of outstanding awards at March 31, 2016	$	71,662				$	119,016
Equity awards exercisable at March 31, 2016		1,704,188		$	5.63							7.0
Aggregate intrinsic value of awards exercisable at March 31, 2016	$	23,888

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended March 31,
	2016			2015
Risk-free interest rate		1.87	%		2.06	%
Expected volatility		89.1	%		93.0	%
Expected life (in years)		10.00			10.00
Expected forfeiture rate		10	%		5	%
Expected dividend yield		0.0	%		0.0	%