Note 8 - Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 13, 2009
Note 8 - Shareholders' Equity (Details) [Line Items]
Share Price (in Dollars per share)	$ 56.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 4.61	$ 5.61	$ 5.55
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 1,365
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	2,058	767	2,309
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	1,514	1,321	1,381
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)				246,640
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Share)				$ 50.92
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares)	1,468,000
Additional Classes Of Stock Authorized	2
Additional Classes Of Stock Authorized, Shares Authorized Per Class (in Shares)	1,000,000
Common Stock, Shares Authorized (in Shares)	150,000,000	150,000,000
Employee Stock Option [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares)	322,000	296,000	275,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,312,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 255 days
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	298	119	248
Employee Stock Option [Member] | Maximum [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Restricted Performance Shares[Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	678	734	1,197
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	1 year 109 days	1 year 109 days
Allocated Share-based Compensation Expense	$ 1,338	$ 710	$ 540