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Note 11 - Share Based Awards (Tables) | 3 Months Ended
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Jul. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table Text Block] |
|  | July 31, 2021 |
Exercise price |  |  | 2.51 - 2.60 |  |
Stock price on date of grant |  |  | 2.51 - 2.60 |  |
Volatility |  |  | 210.68% - 214.17 | % |
Risk-free interest rate |  |  | 0.47% - 1.57 | % |
Expected term (years) |  |  | 3.75 - 10.00 |  |
Dividend yield |  |  | - |  |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
Options |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding as of April 30, 2020 |  |  | 1,597,475 |  |  | $ | 1.10 |  |  |  |  |  |  |  |  |
Granted |  |  | 600,000 |  |  |  | 3.63 |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding as of April 30, 2021 |  |  | 2,197,475 |  |  |  | 1.79 |  |  |  |  |  |  |  |  |
Granted |  |  | 449,000 |  |  |  | 2.57 |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding as of July 31, 2021 |  |  | 2,646,475 |  |  |  | 1.92 |  |  |  | 8.38 |  |  | $ | 3,648,567 |
Exercisable as of July 31, 2021 |  |  | 1,305,810 |  |  | $ | 2.21 |  |  |  | 8.75 |  |  | $ | 1,626,037 |
Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block] |
|  | 2021 |  | 2020
General and administrative |  | $ | 219,601 |  |  | $ | 94,629 |
Research and development |  |  | 56,480 |  |  |  | 9,945 |
Operations |  |  | 63,261 |  |  |  | 2,487 |
Sales and marketing |  |  | 44,744 |  |  |  | - |
Total |  | $ | 384,086 |  |  | $ | 107,061 |

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- Definition Tabular disclosure of all information related to the key inputs and assumptions used in measuring the fair value of assets obtained or liabilities incurred, as the result of a sale of financial assets, relating to the transferor's continuing involvement, if any, at the time of securitization, asset-backed financing arrangement, or similar transfer (including at a minimum, but not limited to, and if applicable, quantitative information about discount rates, expected prepayments including the expected weighted-average life of prepayable financial assets, and anticipated credit losses, including expected static pool losses). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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- Definition Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. + 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 -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 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20517-108367 + Details
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