Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Statement Of Financial Position [Abstract]
Billed receivables, allowance for doubtful accounts	$ 494	$ 541
Inventories, reserves	$ 2,048	$ 1,778
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	9,704,000	9,658,000
Common stock, outstanding	9,704,000	9,658,000