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Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Stock Subscription Receivable [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balances at Apr. 30, 2020 | $ 13 | $ (302) | $ 231,101 |  | $ (220,136) | $ (183) | $ 10,492
Beginning balance, shares at Apr. 30, 2020 | 12,939,420 | (4,251) |  |  |  |  |
Net loss |  |  |  |  | (9,560) |  | (9,560)
Share-based compensation |  |  | 338 |  |  |  | 338
Proceeds from stock options exercises |  |  | 184 | (144) |  |  | 40
Proceeds from stock options exercises, shares | 175,500 |  |  |  |  |  |
Exercise of common warrants, net of costs | $ 1 |  | 2,607 | (1,839) |  |  | 769
Exercise of common warrants, net of costs, shares | 677,500 |  |  |  |  |  |
Issuance of common stock- Aspire financing, net of issuance costs | $ 7 |  | 9,976 |  |  |  | 9,983
Issuance of common stock- Aspire financing, net of issuance costs, shares | 7,275,000 |  |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 30 |  | 66,136 |  |  |  | 66,166
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 29,522,389 |  |  |  |  |  |
Acquisition of treasury stock |  | $ (36) |  |  |  |  | $ (36)
Acquisition of treasury stock, shares |  | (16,789) |  |  |  |  | 0
Other comprehensive gain/(loss) |  |  |  |  |  | 6 | $ 6
Ending Balances at Jan. 31, 2021 | $ 51 | $ (338) | 310,342 | (1,983) | (229,696) | (177) | 78,199
Ending balance, shares at Jan. 31, 2021 | 50,589,809 | (21,040) |  |  |  |  |
Beginning balances at Apr. 30, 2020 | $ 13 | $ (302) | 231,101 |  | (220,136) | (183) | 10,492
Beginning balance, shares at Apr. 30, 2020 | 12,939,420 | (4,251) |  |  |  |  |
Net loss |  |  |  |  |  |  | (14,800)
Ending Balances at Apr. 30, 2021 | $ 52 | $ (338) | 315,821 |  | (234,896) | (171) | 80,468
Ending balance, shares at Apr. 30, 2021 | 52,479,051 | (21,040) |  |  |  |  |
Beginning balances at Oct. 31, 2020 | $ 24 | $ (302) | 240,782 |  | (226,545) | (175) | 13,784
Beginning balance, shares at Oct. 31, 2020 | 24,153,554 | (4,251) |  |  |  |  |
Net loss |  |  |  |  | (3,151) |  | (3,151)
Share-based compensation |  |  | 115 |  |  |  | 115
Proceeds from stock options exercises |  |  | 184 | (144) |  |  | 40
Proceeds from stock options exercises, shares | 175,500 |  |  |  |  |  |
Exercise of common warrants, net of costs | $ 1 |  | 2,607 | (1,839) |  |  | 769
Exercise of common warrants, net of costs, shares | 677,500 |  |  |  |  |  |
Issuance of common stock- Aspire financing, net of issuance costs | $ 2 |  | 6,740 |  |  |  | 6,742
Issuance of common stock- Aspire financing, net of issuance costs, shares | 1,750,000 |  |  |  |  |  |
Issuance of common stock- AGP At The Market offering, net of issuance costs | $ 24 |  | 59,914 |  |  |  | 59,938
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares | 23,833,255 |  |  |  |  |  |
Acquisition of treasury stock |  | $ (36) |  |  |  |  | (36)
Acquisition of treasury stock, shares |  | (16,789) |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  |  | (2) | (2)
Ending Balances at Jan. 31, 2021 | $ 51 | $ (338) | 310,342 | (1,983) | (229,696) | (177) | 78,199
Ending balance, shares at Jan. 31, 2021 | 50,589,809 | (21,040) |  |  |  |  |
Beginning balances at Apr. 30, 2021 | $ 52 | $ (338) | 315,821 |  | (234,896) | (171) | 80,468
Beginning balance, shares at Apr. 30, 2021 | 52,479,051 | (21,040) |  |  |  |  |
Net loss |  |  |  |  | (13,721) |  | (13,721)
Share-based compensation |  |  | 864 |  |  |  | 864
Proceeds from stock options exercises | $ 1 |  | 89 |  |  |  | $ 90
Proceeds from stock options exercises, shares | 85,000 |  |  |  |  |  |
Acquisition of treasury stock, shares |  |  |  |  |  |  | 0
Issuance of shares for acquisition | $ 3 |  | 5,852 |  |  |  | $ 5,855
Issuance of shares in acquisition, shares | 3,330,162 |  |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  |  | (14) | (14)
Ending Balances at Jan. 31, 2022 | $ 56 | $ (338) | 322,626 |  | (248,617) | (185) | 73,542
Ending balance, shares at Jan. 31, 2022 | 55,894,213 | (21,040) |  |  |  |  |
Beginning balances at Oct. 31, 2021 | $ 52 | $ (338) | 316,389 |  | (243,191) | (139) | 72,773
Beginning balance, shares at Oct. 31, 2021 | 52,499,051 | (21,040) |  |  |  |  |
Net loss |  |  |  |  | (5,471) |  | (5,471)
Share-based compensation |  |  | 317 |  |  |  | 317
Proceeds from stock options exercises | $ 1 |  | 68 |  |  |  | 69
Proceeds from stock options exercises, shares | 65,000 |  |  |  |  |  |
Issuance of shares for acquisition | $ 3 |  | 5,852 |  |  |  | 5,855
Issuance of shares in acquisition, shares | 3,330,162 |  |  |  |  |  |
Other comprehensive gain/(loss) |  |  |  |  | 45 | (46) | (1)
Ending Balances at Jan. 31, 2022 | $ 56 | $ (338) | $ 322,626 |  | $ (248,617) | $ (185) | $ 73,542
Ending balance, shares at Jan. 31, 2022 | 55,894,213 | (21,040) |  |  |  |  |

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