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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Treasury Stock, Common [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Apr. 30, 2021 $ 52 $ (338) $ 315,821 $ (234,896) $ (171) $ 80,468
Balance, shares at Apr. 30, 2021 52,479,051 (21,040)        
Net loss (18,874) (18,874)
Share-based compensation 1,169 1,169
Proceeds from stock options exercises $ 1 90 91
Proceeds from stock options exercises, shares 96,000          
Issuance of shares in acquisition $ 3 5,852 5,855
Issuance of shares in acquisition, shares 3,330,162          
Shares withheld for tax withholdings $ (3) (3)
Shares withheld for tax withholdings, shares   (2,312)        
Liquidation of subsidiary 157 157
Other comprehensive gain/(loss) (32) (32)
Shares withheld for tax withholdings $ 3 3
Shares withheld for tax withholdings, shares   2,312        
Balance at Apr. 30, 2022 $ 56 $ (341) 322,932 (253,770) (46) 68,831
Balance, shares at Apr. 30, 2022 55,905,213 (23,352)        
Net loss (26,326) (26,326)
Share-based compensation 1,461 $ 1,461
Proceeds from stock options exercises, shares          
Shares withheld for tax withholdings $ 14 $ 14
Shares withheld for tax withholdings, shares   17,562        
Other comprehensive gain/(loss) 1 1
Common stock issued upon vesting of restricted stock units
Common stock issued upon vesting of restricted stock, shares 399,429          
Shares withheld for tax withholdings $ (14) (14)
Shares withheld for tax withholdings, shares   (17,562)        
Balance at Apr. 30, 2023 $ 56 $ (355) $ 324,393 $ (280,096) $ (45) $ 43,953
Balance, shares at Apr. 30, 2023 56,304,642 (40,914)