Note 13 - Stock-Based Compensation (Detail) - Stock Option Activity (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
2012 Omnibus Incentive Plan [Member]
Outstanding, number of stock options	187,375		0
Outstanding, weighted average exercise price (in Dollars per share)	$ 1.84		$ 0
Outstanding, weighted average remaining contractual life	9 years 6 months
Outstanding, aggregate intrinsic value (in Dollars)	$ 127,309
Exercisable, number of stock options	70,919
Exercisable, weighted average exercise price (in Dollars per share)	$ 2.68
Exercisable, weighted average remaining contractual life	9 years 146 days
Exercisable, aggregate intrinsic value (in Dollars)	42,983
Granted, number of stock options	189,875
Granted, weighted average exercise price (in Dollars per share)	$ 1.82
Exercised, number of stock options	0
Exercised, weighted average exercise price (in Dollars per share)	$ 0
Forfeited or expired, number of stock options	(2,500)
Forfeited or expired, weighted average exercise price (in Dollars per share)	$ 1.84
2006 Stock Incentive Plan [Member]
Outstanding, number of stock options	8,452,340	[1]	9,168,893	[2]
Outstanding, weighted average exercise price (in Dollars per share)	$ 2.56	[1]	$ 2.70	[2]
Outstanding, weighted average remaining contractual life	6 years 292 days	[1]
Outstanding, aggregate intrinsic value (in Dollars)	10,845,396	[1]
Exercisable, number of stock options	5,819,245	[3]
Exercisable, weighted average exercise price (in Dollars per share)	$ 1.92	[3]
Exercisable, weighted average remaining contractual life	5 years 328 days	[3]
Exercisable, aggregate intrinsic value (in Dollars)	10,760,862	[3]
Granted, number of stock options	1,309,750	[4]
Granted, weighted average exercise price (in Dollars per share)	$ 3.69	[4]
Exercised, number of stock options	(901,321)
Exercised, weighted average exercise price (in Dollars per share)	$ 1.39
Forfeited or expired, number of stock options	(1,124,982)	[5]
Forfeited or expired, weighted average exercise price (in Dollars per share)	$ 5.93	[5]
Non-Plan Option Activity [Member]
Outstanding, number of stock options	443,038		443,038
Outstanding, weighted average exercise price (in Dollars per share)	$ 1.34		$ 1.34
Outstanding, weighted average remaining contractual life	6 years 328 days
Outstanding, aggregate intrinsic value (in Dollars)	668,987
Exercisable, number of stock options	443,038
Exercisable, weighted average exercise price (in Dollars per share)	$ 1.34
Exercisable, weighted average remaining contractual life	6 years 328 days
Exercisable, aggregate intrinsic value (in Dollars)	$ 668,987
Granted, number of stock options	0
Granted, weighted average exercise price (in Dollars per share)	$ 0
Exercised, number of stock options	0
Exercised, weighted average exercise price (in Dollars per share)	$ 0
Forfeited or expired, number of stock options	0
Forfeited or expired, weighted average exercise price (in Dollars per share)	$ 0

[1] Includes 135,531 options granted to purchase common stock at a weighted average exercise price of $3.62 per share being held by consultants.

[2] Includes 138,864 outstanding options to purchase common stock at a weighted average exercise price of $3.58 per share being held by consultants.

[3] Includes 91,352 exercisable options to purchase common stock at a weighted average exercise price of $3.06 per share being held by consultants.

[4] Includes 10,000 outstanding options to purchase common stock at a weighted average exercise price of $4.20 per share being held by consultants.

[5] Includes 13,333 of forfeited options to purchase common stock at a weighted average exercise price of $3.60 per share formerly held by consultants.