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Note 12 - Stock-Based Compensation (Details) (USD $)	12 Months Ended								1 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended													12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Diluted [Member]	Dec. 31, 2012 Diluted [Member]	Dec. 31, 2013 Basic [Member]	Dec. 31, 2012 Basic [Member]	Dec. 31, 2013 Nonqualified Options [Member] Employees [Member]	May 31, 2012 Nonqualified Options [Member] Key Employees [Member]	Nov. 30, 2010 Nonqualified Options [Member] Key Employees [Member]	Dec. 31, 2013 Nonqualified Options [Member]	Dec. 31, 2013 Restricted Stock [Member]		Nov. 30, 2010 Performance-based Variable Nonqualified Stock Options [Member] Key Employees [Member]	Dec. 31, 2012 Performance-based Variable Nonqualified Stock Options [Member]	Dec. 31, 2011 Performance-based Variable Nonqualified Stock Options [Member]	Dec. 31, 2012 Annual Grant to Non-employee Member [Member]	Dec. 31, 2011 Annual Grant to Non-employee Member [Member]	Dec. 31, 2013 Increase in Annual Grant of Options, Number of Shares [Member]	Dec. 31, 2013 Amortization, Current Year [Member]	Dec. 31, 2013 Amortization, Next Year [Member]	Dec. 31, 2013 Amortization, Year 3 [Member]	Dec. 31, 2013 Amortization Year 4 [Member]	Dec. 31, 2013 Amortization, Year 5 [Member]	Mar. 02, 2006 1995 Stock Option Plan [Member]	Dec. 31, 2013 2006 Stock Option Plan [Member]	Mar. 02, 2006 2006 Stock Option Plan [Member]	Dec. 31, 2013 2006 Stock Option Plan [Member] Minimum [Member]	Dec. 31, 2013 2006 Stock Option Plan [Member] Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Note 12 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)																									263,500	366,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)																											750,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																												5 years	10 years
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period Percentage								20.00%	20.00%	20.00%		20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in Shares)											35,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 5.13	$ 5.96	$ 6.14								$ 10.44																			$ 5.54	$ 6.06
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)												9,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)												$ 18.17	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	35,000								104,000	50,000				64,000			5,000	2,000
Share Based Compensation Arrangement By Share Based Payment Award Performance Awards Earned (in Shares)																4,442
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (in Shares)															59,558
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 346,000	$ 268,000	$ 162,000
Allocated Share-based Compensation Expense	317,000																199,000	98,000
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	179,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in Shares)																			5,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	123,000	352,000	164,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share (in Dollars per share)				$ (0.02)	$ (0.02)	$ (0.03)	$ (0.02)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	518,000		272,000																	156,000	151,000	120,000	62,000	29,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		139,000	80,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		749,000
Dilutive Securities Effect On Basic Earnings Per Share From Stock Options (in Dollars per share)			$ (0.01)
Share Price (in Dollars per share)	$ 20.72
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 5.92	$ 8.88	$ 6.43										[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	53,000	15,000	33,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 46,000	$ 54,000	$ 19,000
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.

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