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Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Beginning balance 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 (6,409) (6,409)
Share-based compensation 223 223
Issuance of common stock- Aspire financing, net of issuance costs $ 5 3,236 3,241
Issuance of common stock- Aspire financing, net of issuance costs, shares 5,525,000          
Issuance of common stock- AGP At The Market offering, net of issuance costs $ 6 6,088 6,094
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 5,689,134          
Other comprehensive gain/(loss) 8 8
Ending balance at Oct. 31, 2020 $ 24 $ (302) 240,648 (226,545) (175) 13,650
Ending balance, shares at Oct. 31, 2020 24,153,554 (4,251)        
Beginning balance 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 balance 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 balance at Jul. 31, 2020 $ 19 $ (302) 234,089 (223,521) (168) 10,117
Beginning balance, shares at Jul. 31, 2020 18,624,816 (4,251)        
Net loss (3,024) (3,024)
Share-based compensation 107 107
Issuance of common stock- Aspire financing, net of issuance costs 606 606
Issuance of common stock- Aspire financing, net of issuance costs, shares 500,000          
Issuance of common stock- AGP At The Market offering, net of issuance costs $ 5 5,846 5,851
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 5,028,738          
Other comprehensive gain/(loss) (7) (7)
Ending balance at Oct. 31, 2020 $ 24 $ (302) 240,648 (226,545) (175) 13,650
Ending balance, shares at Oct. 31, 2020 24,153,554 (4,251)        
Beginning balance 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 (8,250) (8,250)
Share-based compensation 547 547
Proceeds from stock options exercises 21 21
Proceeds from stock options exercises, shares 20,000          
Other comprehensive gain/(loss) (45) 32 (13)
Ending balance at Oct. 31, 2021 $ 52 $ (338) 316,389 (243,191) (139) 72,773
Ending balance, shares at Oct. 31, 2021 52,499,051 (21,040)        
Beginning balance at Jul. 31, 2021 $ 52 $ (338) 316,211 (237,975) (185) 77,765
Beginning balance, shares at Jul. 31, 2021 52,479,051 (21,040)        
Net loss (5,171) (5,171)
Share-based compensation 157 157
Proceeds from stock options exercises $ 20 21 21
Proceeds from stock options exercises, shares 20,000          
Other comprehensive gain/(loss) (45) 46 1
Ending balance at Oct. 31, 2021 $ 52 $ (338) $ 316,389 $ (243,191) $ (139) $ 72,773
Ending balance, shares at Oct. 31, 2021 52,499,051 (21,040)