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Note 15 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Stock options |  | $ | 554,435 |  |  | $ | 424,904 |  |  | $ | 393,114 |
Restricted stock awards |  |  | 552,907 |  |  |  | 460,853 |  |  |  | 492,410 |
Stock purchase plan |  |  | 79,694 |  |  |  | 61,417 |  |  |  | 55,945 |
|  | $ | 1,187,036 |  |  | $ | 947,174 |  |  | $ | 941,469 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  |  |  |  |  | Exercise |  |  |  |  |  |  | Exercise |  |  |  |  |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Outstanding, beginning |  |  | 587,961 |  |  | $ | 14.83 |  |  |  | 623,176 |  |  | $ | 13.88 |  |  |  | 661,771 |  |  | $ | 13.89 |
Granted |  |  | 43,250 |  |  |  | 43.86 |  |  |  | 76,749 |  |  |  | 22.92 |  |  |  | 73,403 |  |  |  | 17.63 |
Exercised |  |  | (114,100 | ) |  |  | 15.12 |  |  |  | (111,423 | ) |  |  | 14.97 |  |  |  | (79,638 | ) |  |  | 14.70 |
Forfeited |  |  | (3,557 | ) |  |  | 26.74 |  |  |  | (541 | ) |  |  | 18.36 |  |  |  | (32,360 | ) |  |  | 20.69 |
Outstanding, ending |  |  | 513,554 |  |  |  | 17.13 |  |  |  | 587,961 |  |  |  | 14.83 |  |  |  | 623,176 |  |  |  | 13.88 |
Exercisable, ending |  |  | 354,269 |  |  |  |  |  |  |  | 385,372 |  |  |  |  |  |  |  | 405,832 |  |  |  |  |
Weighted average fair value per option granted |  | $ | 14.75 |  |  |  |  |  |  | $ | 7.31 |  |  |  |  |  |  | $ | 5.11 |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Options Exercisable |
|  |  |  |  |  |  |  | Average |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  | Remaining |  |  | Average |  |  |  |  |  |  | Average |
Range of |  | Number |  |  | Contractual |  |  | Exercise |  |  | Number |  |  | Exercise |
Exercise Prices |  | Outstanding |  |  | Life |  |  | Price |  |  | Exercisable |  |  | Price |
$7.99 | to | $8.93 |  |  | 27,850 |  |  |  | 3.06 |  |  | $ | 8.09 |  |  |  | 27,850 |  |  | $ | 8.09 |
$9.00 | to | $9.30 |  |  | 148,755 |  |  |  | 2.77 |  |  |  | 9.22 |  |  |  | 147,955 |  |  |  | 9.22 |
$15.00 | to | $16.85 |  |  | 90,668 |  |  |  | 4.59 |  |  |  | 15.63 |  |  |  | 79,369 |  |  |  | 15.64 |
$17.10 | to | $18.00 |  |  | 132,816 |  |  |  | 6.57 |  |  |  | 17.31 |  |  |  | 81,521 |  |  |  | 17.26 |
$21.71 | to | $31.53 |  |  | 70,215 |  |  |  | 8.08 |  |  |  | 22.63 |  |  |  | 16,273 |  |  |  | 22.64 |
$42.65 | to | $48.50 |  |  | 43,250 |  |  |  | 9.20 |  |  |  | 43.86 |  |  |  | 1,301 |  |  |  | 42.75 |
|  |  |  |  | 513,554 |  |  |  |  |  |  |  |  |  |  |  | 354,269 |  |  |  |  |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Outstanding, beginning |  | $ | 39,438 |  |  | $ | 45,046 |  |  | $ | 49,833 |
Granted |  |  | 28,289 |  |  |  | 22,382 |  |  |  | 28,846 |
Released |  |  | (21,338 | ) |  |  | (27,490 | ) |  |  | (33,633 | )
Forfeited |  |  | - |  |  |  | (500 | ) |  |  | - |
Outstanding, ending |  | $ | 46,389 |  |  | $ | 39,438 |  |  | $ | 45,046 |
Weighted average fair value per share granted |  | $ | 44.44 |  |  | $ | 22.64 |  |  | $ | 17.80 |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Shares granted |  |  | 12,414 |  |  |  | 18,711 |  |  |  | 23,408 |
Shares purchased |  |  | 13,318 |  |  |  | 20,192 |  |  |  | 24,033 |
Weighted average fair value per share granted |  | $ | 6.42 |  |  | $ | 3.28 |  |  | $ | 2.39 |

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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 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: 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=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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