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Note 9 - Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | Warrant shares outstanding |  |  | Weighted Average exercise price |  |  | Weighted Average remaining life |  |  | Intrinsic value |
Outstanding at January 1, 2021 |  |  | 6,369,396 |  |  | $ | 1.97 |  |  | $ | 2.48 |  |  | $ | 2,784,117 |
Issued |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,004,926 | ) |  |  | 1.57 |  |  |  | - |  |  |  |  |
Expired or cancelled |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding and exercisable at June 30, 2021 |  |  | 4,364,470 |  |  | $ | 2.15 |  |  | $ | 2.01 |  |  | $ | 1,796,413 |
|  | Warrant shares outstanding |  |  | Weighted Average exercise price |  |  | Weighted Average remaining life |  |  | Intrinsic value |
Outstanding at January 1, 2020 |  |  | 1,074,171 |  |  | $ | 0.50 |  |  | $ | 4.10 |  |  | $ | 956,012 |
Issued |  |  | 6,459,000 |  |  |  | 2.01 |  |  |  | 3.00 |  |  |  | - |
Exercised |  |  | (1,081,475 | ) |  |  | 0.88 |  |  |  | - |  |  |  | - |
Expired or cancelled |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding and exercisable at June 30, 2020 |  |  | 6,451,696 |  |  | $ | 1.95 |  |  | $ | 2.98 |  |  | $ | 2,430,184 |
Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block] |
|  | June 30, 2021 |  |  | June 30, 2020 |
Shares-to-be-issued, outstanding January 1, 2021 and 2020, respectively |  |  | 2,428,329 |  |  |  | 2,375,760 |
Granted in current period |  |  | 33,238 |  |  |  | 358,482 |
Issued in current period |  |  | (53,416 | ) |  |  | (214,612 | )
Shares-to be issued outstanding June 30, 2021 and 2020, respectively |  |  | 2,408,151 |  |  |  | 2,519,630 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Options |  |  | Weighted Averaged Exercise Price $ |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Options Value $ |
Options outstanding January 1, 2021 |  |  | 1,953,443 |  |  |  | 1.88 |  |  |  | 3.09 |  |  |  | 476,964 |
Granted |  |  | 2,032,175 |  |  |  | 2.48 |  |  |  | - |  |  |  | - |
Exercised during 2021 |  |  | (435,558 | ) |  |  | 1.58 |  |  |  | - |  |  |  | - |
Forfeited or expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Options outstanding June 30, 2021 |  |  | 3,550,060 |  |  |  | 2.26 |  |  |  | 7.00 |  |  |  | 188,018 |
Exercisable, June 30, 2021 |  |  | 745,092 |  |  |  | 1.93 |  |  |  | 2.41 |  |  |  | 124,701 |
|  | Number of Options |  |  | Weighted Averaged Exercise Price $ |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Options Value $ |
Options outstanding January 1, 2020 |  |  | 1,212,442 |  |  |  | 1.71 |  |  |  | 2.40 |  |  |  | - |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised during 2020 |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Forfeited or expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
|  |  | 1,212,442 |  |  |  | 1.71 |  |  |  | 2.40 |  |  |  | - |
Exercisable, June 30, 2020 |  |  | 1,117,829 |  |  |  | 1.84 |  |  |  | 1.84 |  |  |  | - |
|  | Number of Options |  |  | Weighted Averaged Exercise Price $ |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Options Value $ |
Options outstanding January 1, 2021 |  |  | 74,997 |  |  |  | 1.41 |  |  |  | 3.18 |  |  |  | 54,748 |
Granted |  |  | 16,666 |  |  |  | 4.30 |  |  |  |  |  |  |  |  |
Exercised during 2021 |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Options outstanding June 30, 2021 |  |  | 91,663 |  |  |  | 1.69 |  |  |  | 2.87 |  |  |  | 77664 |
Exercisable, June 30, 2021 |  |  | 52,769 |  |  |  | 1.68 |  |  |  | 2.12 |  |  |  | 50,658 |
|  | Number of Options |  |  | Weighted Averaged Exercise Price $ |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Options Value $ |
Options outstanding January 1, 2020 |  |  | 49,998 |  |  |  | 1.87 |  |  |  | 2.94 |  |  |  | - |
Granted |  |  | 8,333 |  |  |  | 1.65 |  |  |  |  |  |  |  | - |
Exercised during 2020 |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Options outstanding June 30, 2020 |  |  | 58,331 |  |  |  | 1.87 |  |  |  | 2.94 |  |  |  |  |
Exercisable, June 30, 2020 |  |  | 41,663 |  |  |  | 1.71 |  |  |  | 2.03 |  |  |  | 84,579 |
Restricted Stock [Member] |
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
Restricted Stock Awards |  | Shares |  |  | Weighted Average Grant-Date Fair Value per Award |
Non-vested as December 31, 2020 |  |  | - |  |  | $ | - |
Granted |  |  | 79,365 |  |  |  | 2.52 |
Vested |  |  | - |  |  |  | - |
Non-vested as June 30, 2021 |  |  | 79,365 |  |  | $ | 2.52 |

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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 warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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