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Note 7 - Stock-Based Compensation (Detail) - Stock-Based Compensation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allocated share based compensation	$ 1,248	$ 2,810	$ 4,274
Tax benefit of stock-based compensation expense	(472)	(959)	(1,412)
After-tax effect of stock based compensation	834	1,851	2,862
Stock Options [Member]
Allocated share based compensation	(66)	2,077	4,170
Restricted Stock Units (RSUs) [Member]
Allocated share based compensation	1,314	672	9
Deferred Directors Fees [Member]
Allocated share based compensation	$ 58	$ 61	$ 95

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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