Accounting Policies (Summary of Revision of Previously Issued Financial Statements - Consolidated Statement of Operations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 17,850	$ 21,442	$ 19,269
Cost of Sales	10,808	13,150	11,619
Gross Profit	7,042	8,292	7,650
Operating Expenses	6,071	6,833	6,105
Operating Income	971	1,459	1,545
Other Income and (Expense)	(202)	(229)	(34)
Income Before Income Taxes	769	1,230	1,511
Income Tax Benefit (Expense)	(143)	(276)	109
Net Income	$ 626	$ 954	$ 1,620
Income Per Common Share
Basic	$ 0.06	$ 0.10	$ 0.17
Diluted	$ 0.06	$ 0.10	$ 0.17
Weighted Average Common Shares Outstanding
Basic	9,661	9,560	9,453
Dilutive effect of stock options	3	212	49
Diluted	9,664	9,772	9,502
As Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales		$ 21,442	$ 19,269
Cost of Sales		13,150	11,619
Gross Profit		8,292	7,650
Operating Expenses		6,833	6,105
Operating Income		1,459	1,545
Other Income and (Expense)		(229)	(34)
Income Before Income Taxes		1,230	1,511
Income Tax Benefit (Expense)		(338)	47
Net Income		$ 892	$ 1,558
Income Per Common Share
Basic		$ 0.09	$ 0.16
Diluted		$ 0.09	$ 0.16
Weighted Average Common Shares Outstanding
Basic		9,560	9,453
Dilutive effect of stock options		212	49
Diluted		9,772	9,502
Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Income Tax Benefit (Expense)		$ 62	$ 62
Net Income		$ 62	$ 62
Income Per Common Share
Basic		$ 0.01	$ 0.01
Diluted		$ 0.01	$ 0.01