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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Jun. 30, 2019
Jun. 30, 2018
Common Class A [Member]    
Common stock; par value (in Dollars per share) $ 0.025 $ 0.025
Common stock, shares authorized 28,000,000 28,000,000
Common stock, shares issued 13,866,751 13,866,691
Treasury stock, class A shares at cost; shares 804,959 790,445
Common Class B [Member]    
Common stock; par value (in Dollars per share) $ 0.025 $ 0.025
Common stock, shares authorized 4,500,000 4,500,000
Common stock, shares issued 0 0
Common Class C [Member]    
Common stock; par value (in Dollars per share) $ 0.025 $ 0.025
Common stock, shares authorized 3,500,000 3,500,000
Common stock, shares issued 2,068,797 2,068,857