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Note 13 - Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 2016 |  |  | 2015 |
Options outstanding at January 1 |  |  |  | 274,500 |  |  |  |  | 274,500 |
Options cancelled |  |  |  | 0 |  |  |  |  | (8,000 | )
Options exercised |  |  |  | (12,000 | ) |  |  |  | (4,000 | )
Options granted |  |  |  | 42,000 |  |  |  |  | 12,000 |
Options outstanding at December 31 |  |  |  | 304,500 |  |  |  |  | 274,500 |
Options available for grant at December 31 |  |  |  | 834,000 |  |  |  |  | 876,000 |
Options exercisable at December 31 |  |  |  | 256,500 |  |  |  |  | 254,500 |
Exercise price ranges per share: |  |  |  |  |  |  |  |  |  |
Granted |  | $3.50 | - | $3.89 |  |  |  | $2.97 |  |
Exercised |  | $0.69 | - | $1.66 |  |  |  | $2.08 |  |
Outstanding |  | $0.69 | - | $3.89 |  |  | $0.69 | - | $3.84 |
Weighted average exercise price per share: |  |  |  |  |  |  |  |  |  |
Granted |  | $ |  | 3.78 |  |  | $ |  | 2.97 |
Exercised |  | $ |  | 1.18 |  |  | $ |  | 2.08 |
Outstanding at December 31 |  | $ |  | 2.06 |  |  | $ |  | 1.76 |
Exercisable at December 31 |  | $ |  | 1.76 |  |  | $ |  | 1.72 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Options Outstanding: |  |  |  |  |  |  |  |  |  |
Range of Exercise Price |  |  | Number Outstanding |  | Wgt. Avg. Contractual Life Remaining (in years) |  | Wgt. Avg. Exercise Price |  |  | Aggregate Intrinsic Value |
$0.69 | - | $1.72 |  |  |  | 226,500 |  | 4.8 |  | $ | 1.54 |  |  | $ | 593,970 |
$2.97 | - | $3.89 |  |  |  | 78,000 |  | 6.8 |  | $ | 3.59 |  |  | $ | 68,880 |
$0.69 | - | $3.89 |  |  |  | 304,500 |  | 5.3 |  | $ | 2.06 |  |  | $ | 662,850 |
Exercisable [Member] |
Notes Tables |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Options Exercisable: |  |  |  |  |  |  |  |  |  |
Range of Exercise Price |  |  | Number Exercisable |  | Wgt. Avg. Contractual Life Remaining (in years) |  | Wgt. Avg. Exercise Price |  |  | Aggregate Intrinsic Value |
$0.69 | - | $1.72 |  |  |  | 226,500 |  | 4.8 |  | $ | 1.54 |  |  | $ | 566,970 |
$2.97 | - | $3.84 |  |  |  | 30,000 |  | 2.4 |  | $ | 3.45 |  |  | $ | 68,880 |
$0.69 | - | $3,84 |  |  |  | 256,500 |  | 4.5 |  | $ | 1.76 |  |  | $ | 635,850 |

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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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