Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	20,000,000	20,000,000
Common stock, outstanding (in shares)	6,273,574	6,249,563
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	10,000,000	10,000,000
Common stock, outstanding (in shares)	768,336	772,742
Allowance for doubtful accounts	$ 843	$ 887