Note 6 - Stockholders Equity and Equity Compensation (Detail) - Summary of Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 2012
Outstanding at January 1, 2012	1,107,712
Outstanding at January 1, 2012 (in Dollars per share)	$ 18.98
Granted	267,880
Granted (in Dollars per share)	$ 18.11
Exercised	(11,623)
Exercised (in Dollars per share)	$ 13.33
Canceled/Expired	(65,008)
Canceled/Expired (in Dollars per share)	$ 23.53
Outstanding at March 31, 2012	1,298,961
Outstanding at March 31, 2012 (in Dollars per share)	$ 18.62
Exercisable at March 31, 2012	839,590
Exercisable at March 31, 2012 (in Dollars per share)	$ 17.21