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Consolidated Statement 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
Beginning balance, value at Apr. 30, 2021 $ 52 $ (338) $ 315,821 $ (234,896) $ (171) $ 80,468
Beginning balance, shares at Apr. 30, 2021 52,479,051 (21,040)        
Net loss (3,079) (3,079)
Share-based compensation 390 390
Other comprehensive loss (14) (14)
Ending balance, value 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)        
Beginning balance, value at Apr. 30, 2022 $ 56 $ (341) 322,932 (253,770) (46) 68,831
Beginning balance, shares at Apr. 30, 2022 55,905,213 (23,352)        
Net loss (5,852) (5,852)
Share-based compensation 333 333
Common stock issued upon vesting of restricted stock
Common stock issued upon exercise of stock options, shares 16,667          
Ending balance, value at Jul. 31, 2022 $ 56 $ (341) $ 323,265 $ (259,622) $ (46) $ 63,312
Ending balance, shares at Jul. 31, 2022 55,921,880 (23,352)