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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]        
Net sales $ 5,439 $ 2,792 $ 9,535 $ 5,387
Cost of sales 3,900 2,096 6,938 3,863
Gross profit 1,539 696 2,597 1,524
Operating expenses:        
Selling expenses 256 186 470 328
General and administrative expenses 452 459 986 950
Research and development costs 435 444 863 829
Total operating expenses 1,143 1,089 2,319 2,107
Operating income (loss) 396 (393) 278 (583)
Interest expense (20) (2) $ (26) (3)
Interest income 1 4 5
Gain from disposal of equipment $ 14 1 $ 14 1
Realized gain on sale of investments 59 59
Income (loss) from continuing operations before income taxes $ 391 (331) $ 266 (521)
Income tax (expense) benefit 129 (1) 138
Income (loss) from continuing operations $ 391 (202) $ 265 (383)
Income from discontinued operations, net of income taxes 10 21
Net income (loss) $ 391 (192) $ 265 (362)
Other comprehensive income, net of tax:        
Unrealized gain from marketable equity investments 162 173
Less: Reclassification of realized gains included in net loss (59) (59)
Comprehensive income (loss) $ 391 $ (89) $ 265 $ (248)
Basic and diluted net income (loss) per share:        
Income (loss) from continuing operations (in dollars per share) $ 0.09 $ (0.05) $ 0.06 $ (0.09)
Income from discontinued operations (in dollars per share)
Net income (loss) (in dollars per share) $ 0.09 $ (0.05) $ 0.06 $ (0.09)
Weighted average common shares outstanding:        
Basic (in shares) 4,143 4,170 4,142 4,190
Diluted (in shares) 4,165 4,170 4,161 4,190
Common shares outstanding (in shares) 4,149 4,170 4,149 4,170