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Consolidated Statements of Shareholders' 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
Balance, value 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 (13,721) (13,721)
Share-based compensation 864 864
Proceeds from stock options exercises $ 1 89 90
Proceeds from stock options exercises, shares 85,000          
Issuance of shares for acquisition $ 3 5,852 5,855
Issuance of shares in acquisition, shares 3,330,162          
Other comprehensive gain/(loss) (14) (14)
Balance, value at Jan. 31, 2022 $ 56 $ (338) 322,626 (248,617) (185) 73,542
Balance, shares at Jan. 31, 2022 55,894,213 (21,040)        
Balance, value at Oct. 31, 2021 $ 52 $ (338) 316,389 (243,191) (139) 72,773
Balance, shares at Oct. 31, 2021 52,499,051 (21,040)        
Net loss (5,471) (5,471)
Share-based compensation 317 317
Proceeds from stock options exercises $ 1 68 69
Proceeds from stock options exercises, shares 65,000          
Issuance of shares for acquisition $ 3 5,852 5,855
Issuance of shares in acquisition, shares 3,330,162          
Other comprehensive gain/(loss) 45 (46) (1)
Balance, value at Jan. 31, 2022 $ 56 $ (338) 322,626 (248,617) (185) 73,542
Balance, shares at Jan. 31, 2022 55,894,213 (21,040)        
Balance, value 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 (16,786) (16,786)
Share-based compensation 911 911
Common stock issued upon vesting of restricted stock
Common stock issued upon vesting of restricted stock, shares 349,429          
Acquisition of treasury stock $ (14) $ (14)
Acquisition of treasury stock, shares   (17,562)        
Proceeds from stock options exercises, shares          
Balance, value at Jan. 31, 2023 $ 56 $ (355) 323,843 (270,556) (46) $ 52,942
Balance, shares at Jan. 31, 2023 56,254,642 (40,914)        
Balance, value at Oct. 31, 2022 $ 56 $ (341) 323,564 (264,466) (46) 58,767
Balance, shares at Oct. 31, 2022 55,921,880 (23,352)        
Net loss (6,090) (6,090)
Share-based compensation 279 279
Common stock issued upon vesting of restricted stock
Common stock issued upon vesting of restricted stock, shares 332,762          
Acquisition of treasury stock $ (14) (14)
Acquisition of treasury stock, shares   (17,562)        
Balance, value at Jan. 31, 2023 $ 56 $ (355) $ 323,843 $ (270,556) $ (46) $ 52,942
Balance, shares at Jan. 31, 2023 56,254,642 (40,914)