Note 5 - Shareholders' Equity (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Repurchase Program, Authorized Amount (in Dollars)	$ 100.0
Treasury Stock, Shares, Acquired	55,000	16,000
Treasury Stock, Value, Acquired, Cost Method (in Dollars)	$ 2.6	$ 0.8
Shares Paid for Tax Withholding for Share Based Compensation	7,000	16,000