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			6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 19,132	$ 21,553	$ 20,433	$ 36,982	$ 42,995	$ 39,702
Cost of Sales	12,001	13,703	13,026	22,809	26,853	24,645
Gross Profit	7,131	7,850	7,407	14,173	16,142	15,057
Operating Expenses	6,412	6,413	6,952	12,483	13,246	13,057
Operating Income	719	1,437	455	1,690	2,896	2,000
Other Income and (Expense)	80	127	(104)	(122)	(102)	(138)
Income Before Income Taxes	799	1,564	351	1,568	2,794	1,862
Income Tax Benefit (Expense)	(48)	45	77	(191)	(231)	186
Net Income	$ 751	$ 1,609	$ 428	$ 1,377	$ 2,563	$ 2,048
Income Per Common Share
Basic	$ 0.08	$ 0.17	$ 0.05	$ 0.14	$ 0.27	$ 0.22
Diluted	$ 0.08	$ 0.16	$ 0.04	$ 0.14	$ 0.26	$ 0.21
Weighted Average Common Shares Outstanding
Basic	9,693	9,615	9,491	9,674	9,588	9,455
Dilutive effect of stock options	5	76	106	13	143	72
Diluted	9,698	9,691	9,597	9,687	9,731	9,527
As Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales		$ 21,553	$ 20,433		$ 42,995	$ 39,702
Cost of Sales		13,703	13,026		26,853	24,645
Gross Profit		7,850	7,407		16,142	15,057
Operating Expenses		6,413	6,952		13,246	13,057
Operating Income		1,437	455		2,896	2,000
Other Income and (Expense)		127	(104)		(102)	(138)
Income Before Income Taxes		1,564	351		2,794	1,862
Income Tax Benefit (Expense)		(17)	15		(355)	62
Net Income		$ 1,547	$ 366		$ 2,439	$ 1,924
Income Per Common Share
Basic		$ 0.16	$ 0.04		$ 0.25	$ 0.20
Diluted		$ 0.16	$ 0.04		$ 0.25	$ 0.20
Weighted Average Common Shares Outstanding
Basic		9,615	9,491		9,588	9,455
Dilutive effect of stock options		76	106		143	72
Diluted		9,691	9,597		9,731	9,527
Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Income Tax Benefit (Expense)		$ 62	$ 62		$ 124	$ 124
Net Income		$ 62	$ 62		$ 124	$ 124
Income Per Common Share
Basic		$ 0.01	$ 0.01		$ 0.02	$ 0.02
Diluted					$ 0.01	$ 0.01