Note 11 - Share-Based Compenseation (Details) - Outstanding stock options (USD $)	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013
Outstanding stock options [Abstract]
Options outstanding at March 31, 2013 (in Shares)		429,500
Options outstanding at March 31, 2013		$ 13.29
Options outstanding at March 31, 2013	2 years 262 days	2 years 266 days
Options outstanding at March 31, 2013 (in Dollars)		$ 12,437,000
Options outstanding at June 30, 2013 (in Shares)	322,000
Options outstanding at June 30, 2013	$ 14.51
Options outstanding at June 30, 2013	2 years 262 days	2 years 266 days
Options outstanding at June 30, 2013 (in Dollars)	12,153,000
Options exercisable at June 30, 2013 (in Shares)	233,250
Options exercisable at June 30, 2013	$ 13.27
Options exercisable at June 30, 2013	2 years 229 days
Options exercisable at June 30, 2013 (in Dollars)	9,091,000
Granted (in Shares)	0
Granted	$ 0
Granted	0 years
Granted	$ 0
Expired (in Shares)	0
Expired	$ 0
Expired	0 years
Expired	$ 0
Exercised (in Shares)	(107,500)
Exercised	$ 9.66
Exercised	0 years
Exercised (in Dollars)	$ 0