Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Statement Of Financial Position [Abstract]
Billed receivables, allowance for doubtful accounts	$ 620	$ 586
Inventories, reserves	$ 2,019	$ 1,929
Preferred stock, par value	$ 0	$ 0
Preferred stock, authorized	1,000,000	1,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	19,000,000	19,000,000
Common stock, issued	9,764,000	9,744,000
Common stock, outstanding	9,764,000	9,744,000