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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Apr. 30, 2019 $ 9,164 $ 56,831 $ (2,111) $ (841) $ 46 $ 63,089
Balance (in Shares) at Apr. 30, 2019 9,163,940     183,661    
Contribution of stock to 401(k) plan   74   $ 50   124
Contribution of stock to 401(k) plan (in Shares)       (10,906)    
Stock-based compensation expense   80       80
Exercise of stock options and stock appreciation rights - net of shares tendered for exercise price   (189)   $ 189    
Exercise of stock options and stock appreciation rights - net of shares tendered for exercise price (in Shares)       (41,325)    
Other comprehensive income, net of tax         134 134
Net loss     (591)     (591)
Balance at Jul. 31, 2019 $ 9,164 56,796 (2,702) $ (602) 180 62,836
Balance (in Shares) at Jul. 31, 2019 9,163,940     131,430    
Balance at Apr. 30, 2020 $ 9,164 56,914 (12,137) $ (195) 490 54,236
Balance (in Shares) at Apr. 30, 2020 9,163,940     42,696    
Contribution of stock to 401(k) plan   68   $ 68   136
Contribution of stock to 401(k) plan (in Shares)       (14,926)    
Stock-based compensation expense   54       $ 54
Exercise of stock options and stock appreciation rights - net of shares tendered for exercise price   (109)   $ 109    
Exercise of stock options and stock appreciation rights - net of shares tendered for exercise price (in Shares)       (23,808)   14,926
Other comprehensive income, net of tax         171 $ 171
Net loss     (262)     (262)
Balance at Jul. 31, 2020 $ 9,164 $ 56,927 $ (12,399) $ (18) $ 661 $ 54,335
Balance (in Shares) at Jul. 31, 2020 9,163,940     3,962