Revenue from Contracts with Customers (Summary of Cumulative Effect of Changes to Unaudited Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net Sales	$ 21,442	$ 19,269
Cost of Sales	13,150	11,619
Gross Profit	8,292	7,650
Operating Expenses
Selling, general and administrative	4,635	4,424
Engineering, research and development	2,198	1,733
Severance, impairment and other charges	0	(52)
Total operating expenses	6,833	6,105
Operating Income	1,459	1,545
Other Income and (Expenses)
Interest expense, net	(27)	(42)
Foreign currency loss, net	(202)	(22)
Other income (expenses), net	0	30
Total other income and (expenses)	(229)	(34)
Income Before Income Taxes	1,230	1,511
Income Tax Expense	(338)	47
Net Income	892	$ 1,558
ASC 606 Adjustments [Member] | ASC 606 [Member]
Net Sales	(2,304)
Cost of Sales	(1,148)
Gross Profit	(1,156)
Operating Expenses
Selling, general and administrative	184
Total operating expenses	184
Operating Income	(1,340)
Other Income and (Expenses)
Income Before Income Taxes	(1,340)
Income Tax Expense	277
Net Income	(1,063)
Balances Without Adoption of ASC 606 [Member] | ASC 606 [Member]
Net Sales	19,138
Cost of Sales	12,002
Gross Profit	7,136
Operating Expenses
Selling, general and administrative	4,819
Engineering, research and development	2,198
Total operating expenses	7,017
Operating Income	119
Other Income and (Expenses)
Interest expense, net	(27)
Foreign currency loss, net	(202)
Total other income and (expenses)	(229)
Income Before Income Taxes	(110)
Income Tax Expense	(61)
Net Income	$ (171)