Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Consolidated Balance Sheets [Abstract]
Trade receivables, allowance for doubtful accounts	$ 1,100	$ 1,200
Common stock, par value	$ 1	$ 1
Common stock, authorized	15,000,000	15,000,000
Common stock, outstanding	7,868,298	7,822,080