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CONSOLIDATED CONDENSED BALANCE SHEETS (PARENTHETICAL) - $ / shares
Oct. 31, 2018
Apr. 30, 2018
Stockholders' equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 6,000,000 6,000,000
Common stock, shares issued 5,995,750 5,995,750
Common stock, shares outstanding 5,995,750 5,995,750