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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)