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Note 14 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] |
|  | Projected Payments |
2018 |  | $ | 18,000 |
2019 |  |  | 12,000 |
2020 |  |  | 10,000 |
2021 |  |  | 2,000 |
Total |  | $ | 42,000 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 2017 |  |  | Weighted Average Exercise Price Per Share |
Outstanding, January 1 |  |  | 29,324 |  |  | $ | 23.67 |
Expired |  |  | (1,337 | ) |  |  | 37.48 |
Exercised |  |  | (8,237 | ) |  |  | 27.97 |
Outstanding, December 31 |  |  | 19,750 |  |  | $ | 20.94 |
Exercisable, December 31 |  |  | 19,750 |  |  | $ | 20.94 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  | Outstanding |  |  | Exercisable |
Grant Date |  | Exercise Price Per Share |  |  | Shares |  |  | Contractual Average Life |  |  | Average Exercise Price Per Share |  |  | Shares |  |  | Average Exercise Price Per Share |
November 10, 2008 |  | $ | 23.00 |  |  |  | 12,300 |  |  |  | 0.85 |  |  | $ | 23.00 |  |  |  | 12,300 |  |  | $ | 23.00 |
May 9, 2011 |  | $ | 17.55 |  |  |  | 7,450 |  |  |  | 3.35 |  |  | $ | 17.55 |  |  |  | 7,450 |  |  | $ | 17.55 |
|  |  |  |  |  |  | 19,750 |  |  |  |  |  |  |  |  |  |  |  | 19,750 |  |  |  |  |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Units |  |  | Weighted Average Grant Date Fair Value Per Share |
Nonvested at January 1, 2017 |  |  | 8,995 |  |  | $ | 32.93 |
Granted |  |  | 5,825 |  |  | $ | 38.70 |
Forfeited |  |  | (219 | ) |  | $ | 38.70 |
Nonvested at December 31, 2017 |  |  | 14,601 |  |  | $ | 35.14 |
Expected to vest at December 31, 2017 |  |  | 14,601 |  |  | $ | 35.14 |

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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=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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