Note 11 - Stock Based Compensation (Detail) - Options Fully Vested and/or Expected to Vest (USD $)	12 Months Ended
	Dec. 31, 2012
Number	254,966
Weighted average remaining contractual life	7 years 306 days
Weighted average exercise price (in Dollars per share)	$ 50.81
From $2.50 to $52.00 [Member]
Number	209,306
Weighted average remaining contractual life	8 years 240 days
Weighted average exercise price (in Dollars per share)	$ 22.58
From $52.01 to $101.50 [Member]
Number	45,452
Weighted average remaining contractual life	4 years 47 days
Weighted average exercise price (in Dollars per share)	$ 77.61
From $101.51 to $151.00 [Member]
Number	208
Weighted average remaining contractual life	2 years 80 days
Weighted average exercise price (in Dollars per share)	$ 105.60