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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts (in Dollars) $ 183 $ 183
Preferred stock, par value (in Dollars per share) $ 1.00 $ 1.00
Preferred stock - shares authorized 600 600
Preferred stock - shares issued 0 0
Common stock, par value (in Dollars per share) $ 1.00 $ 1.00
Common stock shares issued 9,164 9,164
Common stock - authorized shares 20,000 20,000
Common stock - shares outstanding 9,164 9,160
Treasury stock, shares 4 43