Note 13 - Share-Based Compensation (Detail) (USD $)	12 Months Ended					12 Months Ended			24 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2003	Dec. 31, 1993	Dec. 31, 2012 Director [Member]	Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2011 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member]		Dec. 31, 2010 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2012 Available to Issue	Dec. 31, 2011 Available to Issue
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)					1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)				2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years					10 years			5 years	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 444,000						$ 64,000		$ 64,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	269,000	256,000					122,000	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 3.38	$ 2.97					$ 3.59	$ 2.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)	138,252	117,846					(134,304)	(2,100)				138,252	117,846
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	614,917	671,500	699,790				176,476	257,424	176,476		207,380			1,284,675	1,419,700
Allocated Share-based Compensation Expense	893,000	1,005,000
Deferred Other Tax Expense (Benefit)	(96,000)	(145,000)
Proceeds from Stock Options Exercised	889,000	958,000
Tax Benefit from Stock Options Exercised	$ 60,000	$ 55,000
Stock Repurchased During Period, Shares (in Shares)	34,073	8,491										34,073	8,491
Shares, Issued (in Shares)	41,596	10,900

[1] The expected life in years for awards granted was based on the historical exercise patterns experienced by the Company when the award is made.