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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       (3,385) (3,385)
Share-based compensation 116 116
Issuance of common stock- Aspire financing, net of issuance costs $ 5 2,630 2,635
Issuance of common stock- Aspire financing, net of issuance costs, shares 5,025,000          
Issuance of common stock- AGP At The Market offering, net of issuance costs $ 1 242 243
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 660,396          
Other comprehensive gain/(loss)   15 15
Ending balance at Jul. 31, 2020 $ 19 $ (302) 234,089 (223,521) (168) 10,117
Ending balance, shares at Jul. 31, 2020 18,624,816 (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)        
Net loss (3,079) (3,079)
Share-based compensation 390 390
Other comprehensive gain/(loss) 14 (14)
Ending balance at Jul. 31, 2021 $ 52 $ (338) $ 316,211 $ (237,975) $ (185) $ 77,765
Ending balance, shares at Jul. 31, 2021 52,479,051 (21,040)