Summary of Significant Accounting Policies (Summary of Revision of Previously Issued Financial Statements - Consolidated Statement of Operations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales	$ 76,822	$ 84,693	$ 77,947
Cost of Sales	49,630	52,693	50,178
Gross Profit	27,192	32,000	27,769
Operating Expenses	33,950	27,052	25,950
Operating Income	(6,758)	4,948	1,819
Other Income and (Expense)	(245)	(459)	(557)
Income Before Income Taxes	(7,003)	4,489	1,262
Income Tax Benefit (Expense)	212	(516)	(1,177)
Net (Loss) Income	$ (6,791)	$ 3,973	$ 85
(Loss) Income Per Common Share
Basic	$ (0.71)	$ 0.42	$ 0.01
Diluted	$ (0.71)	$ 0.41	$ 0.01
Weighted Average Common Shares Outstanding
Basic	9,612	9,469	9,382
Dilutive effect of stock options	0	110
Diluted	9,612	9,579	9,382
As Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net Sales		$ 84,693	$ 77,947
Cost of Sales		52,693	50,178
Gross Profit		32,000	27,769
Operating Expenses		27,052	25,950
Operating Income		4,948	1,819
Other Income and (Expense)		(459)	(557)
Income Before Income Taxes		4,489	1,262
Income Tax Benefit (Expense)		(773)	(1,430)
Net (Loss) Income		$ 3,716	$ (168)
(Loss) Income Per Common Share
Basic		$ 0.39	$ (0.02)
Diluted		$ 0.39	$ (0.02)
Weighted Average Common Shares Outstanding
Basic		9,469	9,382
Dilutive effect of stock options		110
Diluted		9,579	9,382
Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Income Tax Benefit (Expense)		$ 257	$ 253
Net (Loss) Income		$ 257	$ 253
(Loss) Income Per Common Share
Basic		$ 0.03	$ 0.03
Diluted		$ 0.02	$ 0.03