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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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