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Note 12 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  |  |  | 2021 |  |  |  |  | 2020 |  |
Risk-free interest rate |  |  | 0.46 | - | 1.26% |  |  |  | 0.26 | - | 0.39% |
Dividend yield |  |  |  | 0% |  |  |  |  |  | 0% |  |
Expected term (years) |  |  | 2.5 | - | 5 |  |  |  |  | 5 |  |
Expected volatility |  |  | 46.0 | - | 92.0% |  |  |  | 65.8 | - | 90.3% |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
Options outstanding |
|  |  |  |  |  | Weighted average |  | Weighted average |  | Aggregate |
|  |  |  |  |  | exercise price |  | remaining |  | intrinsic |
|  | Shares |  |  | per share |  | contractual term |  | value |
Outstanding at December 31, 2019 |  |  | 1,349,000 |  |  | $ | 0.23 |  |  |  |  |  |
Options granted |  |  | 235,000 |  |  |  | 0.64 |  |  |  |  |  |
Options exercised |  |  | (50,000 | ) |  |  | 0.20 |  |  |  |  |  |
Options expired |  |  | (99,000 | ) |  |  | 0.18 |  |  |  |  |  |
Options forfeited |  |  | (40,000 | ) |  |  | 0.16 |  |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 1,395,000 |  |  |  | 0.31 |  | 4 years, 5 months |  | $ | 1,591,223 |
Options granted |  |  | 1,982,500 |  |  |  | 4.48 |  |  |  |  |  |
Options exercised |  |  | (453,000 | ) |  |  | 0.21 |  |  |  |  |  |
Options expired |  |  | (20,000 | ) |  |  | 0.17 |  |  |  |  |  |
Options forfeited |  |  | - |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2021 |  |  | 2,904,500 |  |  | $ | 3.17 |  | 4 years, 11 months |  | $ | 5,159,253 |
Exercisable at December 31, 2021 |  |  | 1,952,000 |  |  | $ | 2.73 |  | 4 years, 7 months |  | $ | 4,326,073 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Nonvested |
|  |  |  |  |  | Weighted average |
|  |  |  |  |  | grant date |
|  | Shares |  |  | fair value |
Nonvested at December 31, 2019 |  |  | 23,500 |  |  | $ | 0.17 |
Granted |  |  | 235,000 |  |  |  | 0.36 |
Vested |  |  | (23,500 | ) |  |  | 0.17 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at December 31, 2020 |  |  | 235,000 |  |  | $ | 0.36 |
Granted |  |  | 1,982,500 |  |  |  | 1.55 |
Vested |  |  | (1,265,000 | ) |  |  | 1.35 |
Forfeited |  |  | - |  |  |  | - |
Nonvested at December 31, 2021 |  |  | 952,500 |  |  | $ | 1.51 |

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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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