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Note 11 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Option |  |  | Exercise |  |  | Option |  |  | Exercise |  |  | Option |  |  | Exercise |
|  | Shares |  |  | Price |  |  | Shares |  |  | Price |  |  | Shares |  |  | Price |
Outstanding at January 1 |  |  | 56,400 |  |  | $ | 5.14 |  |  |  | 68,400 |  |  | $ | 5.17 |  |  |  | 72,400 |  |  | $ | 5.16 |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Forfeited or cancelled |  |  | (12,000 | ) |  |  | 5.14 |  |  |  | (12,000 | ) |  |  | 5.30 |  |  |  | (2,000 | ) |  |  | 4.96 |
Exercised |  |  | (44,400 | ) |  |  | 5.14 |  |  |  | - |  |  |  | - |  |  |  | (2,000 | ) |  |  | 4.96 |
Outstanding at December 31 |  |  | - |  |  | $ | - |  |  |  | 56,400 |  |  | $ | 5.14 |  |  |  | 68,400 |  |  | $ | 5.17 |
Exercisable at end of year |  |  | - |  |  | $ | - |  |  |  | 56,400 |  |  | $ | 5.14 |  |  |  | 68,400 |  |  | $ | 5.17 |
Weighted-average fair value of options granted during year |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  |  |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Grant Fair Value |
Balance, January 1, 2016 |  |  | 60,432 |  |  | $ | 8.97 |
Granted |  |  | 33,685 |  |  |  | 7.14 |
Forfeited |  |  | (8,187 | ) |  |  | 8.97 |
Vested |  |  | (20,780 | ) |  |  | 8.97 |
Balance, December 31, 2016 |  |  | 65,150 |  |  | $ | 8.03 |
Balance, January 1, 201 7 |  |  | 65,150 |  |  | $ | 8.03 |
Granted |  |  | 9,005 |  |  |  | 8.05 |
Forfeited |  |  | (4,054 | ) |  |  | 8.97 |
Vested |  |  | (33,300 | ) |  |  | 8.97 |
Balance, December 31, 201 7 |  |  | 36,801 |  |  | $ | 8.03 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] |
201 8 |  | $ | 100,127 |
201 9 |  |  | 58,126 |
20 20 |  |  | 14,853 |
202 1 |  |  | 1,208 |

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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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