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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 (6,214) (6,214)
Stock based compensation 168 168
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        
Common stock issued for commitment fee 294 294
Common stock issued for commitment fee, shares 194,805          
Issuance of common stock- AGP At The Market offering, net of issuance costs $ 1 745 746
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 519,478        
Acquisition of treasury stock $ (1) $ (1)
Acquisition of treasury stock, shares (481)
Other comprehensive gain/(loss) $ (2) $ (2)
Balance at Oct. 31, 2019 $ 7 $ (302) 227,214 (215,998) (173) 10,748
Balance, shares at Oct. 31, 2019 6,489,668 (4,251)        
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)        
Net loss (3,189) (3,189)
Stock based compensation 76 76
Common stock issued for commitment fee $ 294 $ 294
Common stock issued for commitment fee, shares 194,805
Issuance of common stock- AGP At The Market offering, net of issuance costs $ 1 $ 745 $ 746
Issuance of common stock- AGP At The Market offering, net of issuance costs, shares 519,478        
Other comprehensive gain/(loss)         (7) (7)
Balance at Oct. 31, 2019 $ 7 $ (302) 227,214 (215,998) (173) 10,748
Balance, shares at Oct. 31, 2019 6,489,668 (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 (6,409) (6,409)
Stock based compensation 223 223
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
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        
Balance at Oct. 31, 2020 $ 24 $ (302) 240,648 (226,545) (175) 13,650
Balance, shares at Oct. 31, 2020 24,153,554 (4,251)        
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)        
Net loss (3,024) (3,024)
Stock based compensation 107 107
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)
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        
Balance at Oct. 31, 2020 $ 24 $ (302) $ 240,648 $ (226,545) $ (175) $ 13,650
Balance, shares at Oct. 31, 2020 24,153,554 (4,251)