CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 5,162	$ 5,129
Cost of sales	3,302	3,705
Gross profit	1,860	1,424
Operating expenses:
Selling expenses	87	149
General and administrative expenses	504	564
Impairment of intangible assets		113
Research and development costs	407	304
Total operating expenses	998	1,130
Operating income	862	294
Other income (expense):
Interest and miscellaneous income	30	3
Interest expense	(2)	(3)
Total other income (expense)	28
Income before income taxes	890	294
Provision for income taxes	262	7
Net income from continuing operations	628	287
Net loss from discontinued operations net of tax of $0		(1)
Net income	628	286
Other comprehensive loss, net of tax:
Unrealized loss from marketable equity investments, net of taxes	(109)
Comprehensive income	$ 519	$ 286
Basic and diluted income per share:
Net income from continuing operations	$ 0.15	$ 0.07
Net income from discontinued operations
Net income	$ 0.15	$ 0.07
Weighted average common shares outstanding:
Basic	4,150,099	4,062,475
Diluted	4,189,724	4,103,459
Common shares outstanding	4,348,292	4,063,837