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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]        
Net sales $ 5,560 $ 4,599 $ 10,723 $ 9,728
Cost of sales 3,843 3,288 7,145 6,995
Gross profit 1,717 1,311 3,578 2,733
Operating expenses:        
Selling expenses 87 159 174 308
General and administrative expenses 576 605 1,080 1,169
Impairment of goodwill and intangible assets 229 229 113
Research and development costs 478 278 885 581
Total operating expenses 1,370 1,042 2,368 2,171
Operating income 347 269 1,210 562
Interest expense (2) (4) (4) (7)
Interest income 75 11 93 12
Gain from disposal of equipment 3 15 3
Income from continuing operations before income taxes 423 276 1,314 570
Income tax (expense) benefit (78) 2,859 (341) 2,852
Income from continuing operations 345 3,135 973 3,422
Income from discontinued operations, net of income taxes 59 58
Net income 345 3,194 973 3,480
Other comprehensive loss, net of tax:        
Unrealized loss from marketable equity investments (15) (6) (124) (6)
Comprehensive income $ 330 $ 3,188 $ 849 $ 3,474
Basic net income per share:        
Income from continuing operations $ 0.08 $ 0.77 $ 0.23 $ 0.84
Income from discontinued operations 0.02 0.01
Net income 0.08 0.79 0.23 0.85
Diluted net income per share:        
Income from continuing operations 0.08 0.77 0.23 0.84
Income from discontinued operations 0.01 0.01
Net income $ 0.08 $ 0.78 $ 0.23 $ 0.85
Weighted average common shares outstanding:        
Basic 4,359 4,057 4,255 4,060
Diluted 4,400 4,092 4,295 4,098
Common shares outstanding 4,360 4,040 4,360 4,040