Note 11 - Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

Stock Options	Number Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at January 1, 2012		691,809		$	16.88
Granted		145,611			10.08
Exercised		(47,575	)		14.67
Canceled or expired		(64,316	)		29.43
Outstanding at December 31, 2012		725,529		$	14.63
Granted		187,777			4.39
Exercised		(12,429	)		14.67
Canceled or expired		(38,972	)		16.79
Outstanding at December 31, 2013		861,905		$	12.29
Granted		1,014,700			3.53
Exercised	–			–
Canceled or expired		(131,850	)		19.05
Outstanding at December 31, 2014		1,744,755			7.20		7.5	$	-
Exercisable at December 31, 2014		990,936		$	9.71		6.1	$	-

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

Restricted Stock	Number Outstanding			Weighted Average Exercise Price
Non-vested stock awards outstanding at January 1, 2012		12,193		$	14.22
Granted		2,942			16.47
Vested and issued		(9,135	)		15.17
Forfeited		(1,703	)		12.56
Non-vested stock awards outstanding at December 31, 2012		4,297		$	14.63
Granted		111			5.36
Vested and issued		(444	)		8.40
Forfeited		(1,855	)		15.69
Non-vested stock awards outstanding at December 31, 2013		2,109		$	14.13
Granted		26,250			3.46
Vested and issued		(21,341	)		4.77
Forfeited	–			–
Non-vested stock awards outstanding at December 31, 2014		7,018		$	3.32

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Options Outstanding						Options Exercisable
		Range of Exercise Prices	Number		Weighted Average Remaining Contractual Term (in years)		Weighted Average Exercise Price		Number		Weighted Average Remaining Contractual Term (in years)		Weighted Average Exercise Price
$ 2.00	-	$3.99		956,700		9.4	$	3.53		293,266		9.4	$	3.54	$
$ 4.00	-	$8.99		185,778		7.6	$	4.46		131,044		7.2	$	4.41
$ 9.00	-	$13.49		434,445		4.9	$	11.12		401,461		4.7	$	11.25
$ 13.50	-	$31.49		165,870		3.4	$	20.81		163,203		3.3	$	20.80
Above $31.50				1,962		0.5	$	38.07		1,962		0.5	$	38.09
				1,744,755						990,936

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

	Year Ended December 31,
	2014				2013				2012
Risk-free interest rate	2.31	to	2.75	%	0.85	to	1.19	%	1.09	to	2.97	%
Expected volatility	94.3	-	100.7	%	83.4	-	97.9	%	80.8	-	82.3	%
Expected life (in years)		10			5.25	to	6.00		5.00	to	6.25
Expected forfeiture rate		10		%	5.0	to	7.5	%		7.5		%
Expected dividend yield		0.0		%		0.0		%		0.0		%