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Note 14 - Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | 2017 |  |  | 2016 |
Options outstanding at January 1 |  |  | 304,500 |  |  |  | 274,500 |
Options cancelled |  |  | (18,000 | ) |  |  | 0 |
Options exercised |  |  | (60,000 | ) |  |  | (12,000 | )
Options granted |  |  | 17,000 |  |  |  | 42,000 |
Options outstanding at December 31 |  |  | 243,500 |  |  |  | 304,500 |
Options available for grant at December 31 |  |  | 817,000 |  |  |  | 834,000 |
Options exercisable at December 31 |  |  | 206,500 |  |  |  | 256,500 |
Exercise price ranges per share: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  |  | 3.86 |  |  |  | $ | 3.50 | - | $3.89 |
Exercised |  | $ | 1.52 | - | $1.72 |  |  | $ | 0.69 | - | $1.66 |
Outstanding |  | $ | 0.69 | - | $3.89 |  |  | $ | 0.69 | - | $3.89 |
Weighted average exercise price per share: |  |  |  |  |  |  |  |  |  |  |  |
Granted |  | $ | 3.86 |  |  | $ | 3.78 |
Exercised |  | $ | 1.63 |  |  | $ | 1.18 |
Outstanding at December 31 |  | $ | 2.17 |  |  | $ | 2.06 |
Exercisable at December 31 |  | $ | 1.87 |  |  | $ | 1.76 |
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 (yrs) |  |  | Wgt. Avg. Exercise Price |  |  | Aggregate Intrinsic Value |
$0.69 | - | $1.72 |  |  | 166,500 |  |  |  | 3.9 |  |  | $ | 1.50 |  |  | $ | 508,730 |
$2.97 | - | $3.89 |  |  | 77,000 |  |  |  | 7.3 |  |  | $ | 3.60 |  |  | $ | 74,000 |
$0.69 | - | $3.89 |  |  | 243,500 |  |  |  | 5.0 |  |  | $ | 2.17 |  |  | $ | 582,730 |
Options Exercisable: |  |  |  |  |  |  |  |  |  |  |  |
Range of Exercise Price |  | Number Exercisable |  | Wgt. Avg. Contractual Life Remaining (yrs) |  |  | Wgt. Avg. Exercise Price |  |  | Aggregate Intrinsic Value |
$0.69 | - | $1.72 |  |  | 166,500 |  |  |  | 3.9 |  |  | $ | 1.50 |  |  | $ | 508,730 |
$2.97 | - | $3.89 |  |  | 40,000 |  |  |  | 5.8 |  |  | $ | 3.38 |  |  | $ | 47,260 |
$0.69 | - | $3.89 |  |  | 206,500 |  |  |  | 4.3 |  |  | $ | 1.87 |  |  | $ | 555,990 |

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