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Note 8 - Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Outstanding – January 1, 2018 |  |  | 187,750 |  |  | $ | 3.70 |  |  |  |  |  |  |  |
Granted |  |  | 134,000 |  |  |  | 3.36 |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |
Cancelled |  |  | (97,000 | ) |  |  | (3.84 | ) |  |  |  |  |  |  |
Outstanding – December 31, 2018 |  |  | 224,750 |  |  | $ | 3.44 |  |  | 8.60 |  |  | $ | 52,715 |
Granted |  |  | 186,200 |  |  |  | 4.31 |  |  |  |  |  |  |  |
Exercised |  |  | (2,250 | ) |  |  | (3.20 | ) |  |  |  |  |  |  |
Cancelled |  |  | (36,500 | ) |  |  | (3.66 | ) |  |  |  |  |  |  |
Outstanding – December 31, 2019 |  |  | 372,200 |  |  | $ | 3.85 |  |  | 8.57 |  |  | $ | 379,429 |
Exercisable on December 31, 2019 |  |  | 107,567 |  |  | $ | 3.44 |  |  | 7.69 |  |  | $ | 154,305 |

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