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Note 12 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares Under Option |  |  | Weighted- Average Exercise Price |
Outstanding —January 1, 2015: |  |  | 86,348 |  |  | $ | 11.09 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (20,250 | ) |  |  | 11.65 |
Canceled |  |  | - |  |  |  | - |
Outstanding —December 31, 2015: |  |  | 66,098 |  |  | $ | 10.92 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (7,917 | ) |  |  | 11.41 |
Canceled |  |  | (2,050 | ) |  |  | 10.91 |
Outstanding —December 31, 2016: |  |  | 56,131 |  |  | $ | 10.85 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (11,063 | ) |  |  | 11.13 |
Canceled |  |  | - |  |  |  | - |
Outstanding —December 31, 2017: |  |  | 45,068 |  |  | $ | 10.79 |
Options exercisable —December 31, 2017: |  |  | 45,068 |  |  | $ | 10.79 |
Share-based Compensation, Activity [Table Text Block] |
|  | Shares Under Option |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value* |
|  |  |  |  |  | (per share) |  |  | (in years) |  |  |  |  |
Outstanding at January 1, 201 7 |  |  | 56,131 |  |  | $ | 10.85 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (11,063 | ) |  |  | 11.13 |  |  |  |  |  |  |  |  |
Canceled/forfeited/expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding at December 31, 201 7 |  |  | 45,068 |  |  | $ | 10.79 |  |  |  | 2.8 |  |  | $ | 1,065,600 |
Fully vested and exercisable at December 31, 201 7 |  |  | 45,068 |  |  | $ | 10.79 |  |  |  | 2.8 |  |  | $ | 1,065,600 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Stock Options |  |  | Restricted Stock |
|  | Number of Options |  |  | Weighted- Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value* |
Nonvested at January 1, 201 7 |  |  | 12,800 |  |  | $ | 6.06 |  |  |  | 7,050 |  |  | $ | 36.35 |
Granted |  |  | - |  |  |  | - |  |  |  | 104,298 |  |  |  | 16.38 |
Canceled/forfeited/expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Vested |  |  | (12,800 | ) |  |  | 6.06 |  |  |  | (7,198 | ) |  |  | 24.85 |
Nonvested at December 31, 201 7 |  |  | - |  |  |  | - |  |  |  | 104,150 |  |  | $ | 17.14 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Exercise Price |  |  | Shares Under Outstanding Options |  |  | Weighted-Average Remaining Contractual Term |  |  | Shares Under Exercisable Options |
|  |  |  |  |  |  |  | (in years) |  |  |  |  |
| $10.44 |  |  |  | 15,000 |  |  |  | 0.2 |  |  |  | 15,000 |
| $10.90 |  |  |  | 24,600 |  |  |  | 4.4 |  |  |  | 24,600 |
| $11.22 |  |  |  | 5,468 |  |  |  | 2.9 |  |  |  | 5,468 |
|  |  |  |  | 45,068 |  |  |  | 2.8 |  |  |  | 45,068 |

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- Definition Tabular disclosure for share-based compensation 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 (c)(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 2 -Subparagraph (d) -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 (e) -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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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