Note 11 - Stock Options and Restricted Stock (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	For the Year Ended December 31,
		2017
Expected volatility		89	-	93%
Risk-free interest rate		1.4	–	1.5%
Dividend yield		-	-	-
Expected term (in years)		3.0	–	3.5

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares				Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017		4,211,168			$	1.09		2.85	$	46
Granted		2,971,600				0.32
Exercised		-				-
Forfeited or Expired		( 2,368,334	)	(1)		0.90
Outstanding at December 31, 2017		4,814,434			$	0.71		3.46	$	1,007
Granted		-
Exercised		(1,230,002	)			0.44
Forfeited or Expired		(1,039,767	)			0.71
Outstanding at December 31, 2018		2,544,665			$	0.85		2.54	$	93
Vested at December 31, 2018		1,950,832			$	1.00		2.29	$	64
Exercisable at December 31, 2018		1,950,832			$	1.00		2.29	$	64

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted- Average Grant- Date Fair Value
Non-vested at January 1, 2017		1,659,834		$	0.58
Granted		2,971,600			0.19
Vested		( 2,003,167	)		0.43
Forfeited		( 96,668	)		0.55
Non-vested at December 31, 2017		2,531,599		$	0.24
Granted		-			-
Vested		(1,284,666	)		0.27
Forfeited		(653,100	)		0.22
Non-vested at December 31, 2018		593,833		$	0.20

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of Shares			Weighted Average Grant- Date Fair Value
Restricted shares at January 1, 2018		-			-
Granted		1,042,500			1.07
Vested		(58,333	)		1.11
Forfeited		(147,500	)		0.72
Restricted shares at December 31, 2018		836,667			0.98