CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Mar. 31, 2018	Jun. 30, 2017
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	13,866,691	13,866,601
Treasury stock, class A shares at cost; shares	790,986	751,303
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	2,068,857	2,068,947