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Note 6 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three Months Ended |  |  | Three Months Ended |  |  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2021 |  |  | June 30, 2020 |  |  | June 30, 2021 |  |  | June 30, 2020 |
Risk-free interest rate |  | 0.77% | - | 0.87% |  |  |  | 0.33% |  |  |  | 0.46% | - | 0.92% |  |  |  | 0.33% |  |
Dividend yield |  |  | 0% |  |  |  |  | 0% |  |  |  |  | 0% |  |  |  |  | 0% |  |
Expected term (in years) |  |  | 5 |  |  |  |  | 5 |  |  |  |  | 5 |  |  |  |  | 5 |  |
Expected volatility |  | 47.1% | - | 47.7% |  |  | 65.8% | - | 66.0% |  |  | 47.1% | - | 92.6% |  |  | 65.8% | - | 66.0% |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Options outstanding |  |  |  |  |  |
|  |  |  |  |  | Weighted average |  | Weighted average |  | Aggregate |
|  |  |  |  |  | exercise price |  | remaining |  | intrinsic |
Incentive Options |  | Shares |  |  | per share |  | contractual term |  | value |
Outstanding at December 31, 2020 |  |  | 1,395,000 |  |  | $ | 0.31 |  |  |  |  |  |
Options granted |  |  | 145,000 |  |  |  | 2.62 |  |  |  |  |  |
Options exercised |  |  | (25,000 | ) |  |  | 0.14 |  |  |  |  |  |
Outstanding at March 31, 2021 |  |  | 1,515,000 |  |  | $ | 0.53 |  |  |  |  |  |
Options granted |  |  | 127,500 |  |  |  | 2.85 |  |  |  |  |  |
Options exercised |  |  | (360,000 | ) |  |  | 0.22 |  |  |  |  |  |
Options expired |  |  | (20,000 | ) |  |  | 0.17 |  |  |  |  |  |
Outstanding at June 30, 2021 |  |  | 1,262,500 |  |  | $ | 0.86 |  | 6 years |  | $ | 2,876,868 |
Exercisable at June 30, 2021 |  |  | 780,000 |  |  | $ | 0.33 |  | 3 years, 2 months |  | $ | 2,194,843 |
Outstanding at December 31, 2019 |  |  | 1,349,000 |  |  | $ | 0.23 |  |  |  |  |  |
Options expired |  |  | (129,000 | ) |  |  | 0.17 |  |  |  |  |  |
Outstanding at March 31, 2020 |  |  | 1,220,000 |  |  |  | 0.24 |  |  |  |  |  |
Options granted |  |  | 10,000 |  |  |  | 0.15 |  |  |  |  |  |
Options expired |  |  | (10,000 | ) |  |  | 0.19 |  |  |  |  |  |
Outstanding at June 30, 2020 |  |  | 1,220,000 |  |  | $ | 0.24 |  | 3 years, 9 months |  | $ | 37,353 |
Exercisable at June 30, 2020 |  |  | 1,207,000 |  |  | $ | 0.24 |  | 3 years, 8 months |  | $ | 36,703 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Nonvested |
|  |  |  |  |  | Weighted average |
|  |  |  |  |  | grant date |
|  | Shares |  |  | fair value |
Nonvested at December 31, 2020 |  |  | 235,000 |  |  | $ | 0.36 |
Granted |  |  | 145,000 |  |  |  | 1.22 |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Nonvested at March 31, 2021 |  |  | 380,000 |  |  | $ | 0.94 |
Granted |  |  | 127,500 |  |  |  | 1.19 |
Vested |  |  | (25,000 | ) |  |  | 1.01 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at June 30, 2021 |  |  | 482,500 |  |  | $ | 0.94 |
Nonvested at December 31, 2019 |  |  | 23,500 |  |  | $ | 0.17 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | (5,000 | ) |  |  | 0.21 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at March 31, 2020 |  |  | 18,500 |  |  | $ | 0.15 |
Granted |  |  | 10,000 |  |  |  | 0.08 |
Vested |  |  | (15,500 | ) |  |  | 0.16 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at June 30, 2020 |  |  | 13,000 |  |  | $ | 0.09 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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