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Note 14 - Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Stock option and incentive plans |  | $ | 734,827 |  |  | $ | 798,929 |  |  | $ | 587,900 |
Stock purchase plan |  |  | 57,452 |  |  |  | 50,831 |  |  |  | 58,519 |
Stock appreciation rights |  |  | - |  |  |  | - |  |  |  | 49,988 |
|  | $ | 792,279 |  |  | $ | 849,760 |  |  | $ | 696,407 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |
Outstanding, beginning |  |  | 608,852 |  |  | $ | 13.27 |  |  |  | 535,130 |  |  | $ | 13.85 |  |  |  | 510,612 |  |  | $ | 14.04 |
Granted |  |  | 96,232 |  |  |  | 15.68 |  |  |  | 102,722 |  |  |  | 9.30 |  |  |  | 73,250 |  |  |  | 8.23 |
Exercised |  |  | (41,258 | ) |  |  | 10.06 |  |  |  | (17,876 | ) |  |  | 9.68 |  |  |  | (36,459 | ) |  |  | 8.30 |
Forfeited |  |  | (1,320 | ) |  |  | 10.53 |  |  |  | (11,124 | ) |  |  | 10.57 |  |  |  | (12,273 | ) |  |  | 8.28 |
Outstanding, ending |  |  | 662,506 |  |  |  | 13.82 |  |  |  | 608,852 |  |  |  | 13.27 |  |  |  | 535,130 |  |  |  | 13.85 |
Exercisable, ending |  |  | 419,735 |  |  |  |  |  |  |  | 391,378 |  |  |  |  |  |  |  | 355,398 |  |  |  |  |
Weighted average fair value per option of options granted during the period |  | $ | 5.14 |  |  |  |  |  |  | $ | 2.79 |  |  |  |  |  |  | $ | 2.74 |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Options Exercisable |
Range o f Exercise Prices |  | Number Outstanding |  |  | Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$7.72 | to | $8.93 |  |  | 58,510 |  |  |  | 6.91 |  |  | $ | 8.12 |  |  |  | 22,520 |  |  | $ | 8.21 |
$9.00 | to | $11.64 |  |  | 212,004 |  |  |  | 6.82 |  |  |  | 9.21 |  |  |  | 101,355 |  |  |  | 9.19 |
$13.25 | to | $16.85 |  |  | 243,567 |  |  |  | 5.90 |  |  |  | 15.85 |  |  |  | 149,435 |  |  |  | 15.99 |
$17.00 | to | $18.60 |  |  | 51,840 |  |  |  | 2.05 |  |  |  | 18.05 |  |  |  | 49,840 |  |  |  | 18.06 |
$18.67 | to | $20.90 |  |  | 67,885 |  |  |  | 1.16 |  |  |  | 19.48 |  |  |  | 67,885 |  |  |  | 19.48 |
$21.00 | to | $22.00 |  |  | 28,700 |  |  |  | 1.16 |  |  |  | 21.28 |  |  |  | 28,700 |  |  |  | 21.28 |
|  |  |  |  | 662,506 |  |  |  |  |  |  |  |  |  |  |  | 419,735 |  |  |  |  |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Shares granted |  |  | 27,415 |  |  |  | 29,671 |  |  |  | 34,860 |
Shares purchased |  |  | 27,110 |  |  |  | 31,554 |  |  |  | 36,174 |
Weighted average fair value per share granted |  | $ | 2.10 |  |  | $ | 1.71 |  |  | $ | 1.68 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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