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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Shares [Member]
Treasury Shares [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance at Apr. 30, 2019 $ 5 $ (301) $ 226,026 $ (209,784) $ (171) $ 15,775
Balance, shares at Apr. 30, 2019 5,425,517 (3,770)        
Net loss (3,025) (3,025)
Stock based compensation 92 92
Issuance (forfeiture) of restricted stock, net
Issuance (forfeiture) of restricted stock, net, shares (132)          
Exercise of prefunded warrants, net of issuance costs $ 1 (19) (18)
Exercise of prefunded warrants, net of issuance costs shares 350,000        
Acquisition of treasury stock $ (1) (1)
Acquisition of treasury stock, shares (481)        
Other comprehensive gain/(loss) 5 5
Balance at Jul. 31, 2019 $ 6 $ (302) 226,099 (212,809) (166) 12,828
Balance, shares at Jul. 31, 2019 5,775,385 (4,251)        
Balance at Apr. 30, 2020 $ 13 $ (302) 231,101 (220,136) (183) 10,493
Balance, shares at Apr. 30, 2020 12,939,420 (4,251)        
Net loss (3,385) (3,385)
Stock 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
Balance at Jul. 31, 2020 $ 19 $ (302) $ 234,089 $ (223,521) $ (168) $ 10,117
Balance, shares at Jul. 31, 2020 18,624,816 (4,251)