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			9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 12,673	$ 15,632	$ 21,397	$ 49,655	$ 58,627	$ 61,099
Cost of Sales	8,267	10,485	13,475	31,076	37,338	38,120
Gross Profit	4,406	5,147	7,922	18,579	21,289	22,979
Operating Expenses	8,352	6,227	6,829	20,835	19,473	19,886
Operating (Loss) Income	(3,946)	(1,080)	1,093	(2,256)	1,816	3,093
Other Income and (Expense)	(337)	(115)	34	(459)	(217)	(104)
(Loss) Income Before Income Taxes	(4,283)	(1,195)	1,127	(2,715)	1,599	2,989
Income Tax Benefit (Expense)	347	193	(44)	156	(38)	142
Net (Loss) Income	$ (3,936)	$ (1,002)	$ 1,083	$ (2,559)	$ 1,561	$ 3,131
(Loss) Income Per Common Share
Basic	$ (0.41)	$ (0.10)	$ 0.12	$ (0.26)	$ 0.16	$ 0.33
Diluted	$ (0.41)	$ (0.10)	$ 0.12	$ (0.26)	$ 0.16	$ 0.33
Weighted Average Common Shares Outstanding
Basic	9,708	9,627	9,539	9,687	9,601	9,468
Dilutive effect of stock options	0	0	152	0	110	74
Diluted	9,708	9,627	9,691	9,687	9,711	9,542
As Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales		$ 15,632	$ 21,397		$ 58,627	$ 61,099
Cost of Sales		10,485	13,475		37,338	38,120
Gross Profit		5,147	7,922		21,289	22,979
Operating Expenses		6,227	6,829		19,473	19,886
Operating (Loss) Income		(1,080)	1,093		1,816	3,093
Other Income and (Expense)		(115)	34		(217)	(104)
(Loss) Income Before Income Taxes		(1,195)	1,127		1,599	2,989
Income Tax Benefit (Expense)		130	(107)		(225)	(45)
Net (Loss) Income		$ (1,065)	$ 1,020		$ 1,374	$ 2,944
(Loss) Income Per Common Share
Basic		$ (0.11)	$ 0.11		$ 0.14	$ 0.31
Diluted		$ (0.11)	$ 0.11		$ 0.14	$ 0.31
Weighted Average Common Shares Outstanding
Basic		9,627	9,539		9,601	9,468
Dilutive effect of stock options			152		110	74
Diluted		9,627	9,691		9,711	9,542
Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Income Tax Benefit (Expense)		$ 63	$ 63		$ 187	$ 187
Net (Loss) Income		$ 63	$ 63		$ 187	$ 187
(Loss) Income Per Common Share
Basic		$ 0.01	$ 0.01		$ 0.02	$ 0.02
Diluted		$ 0.01	$ 0.01		$ 0.02	$ 0.02