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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]        
Net sales $ 6,618 $ 5,176 $ 16,346 $ 14,199
Cost of sales 4,156 3,863 11,150 10,557
Gross profit 2,462 1,313 5,196 3,642
Operating expenses:        
Selling expenses 132 171 439 564
General and administrative expenses 725 420 1,894 1,407
Impairment of goodwill and long-lived assets 245 113 245
Research and development costs 257 301 839 829
Total operating expenses 1,114 1,137 3,285 3,045
Operating income 1,348 176 1,911 597
Interest expense (3) (10) (10) (36)
Interest income 8 19
Gain from sale of Investment in Ramsey Property 340 340
Gain from disposal of equipment 4 3 18
Income from continuing operations before income taxes 1,353 510 1,923 919
Income tax (expense) benefit (650) (16) 2,202 (16)
Income from continuing operations 703 494 4,125 903
Income (loss) from discontinued operations, net of income taxes 185 (126) 243 (270)
Net income 888 368 4,368 633
Other comprehensive income, net of tax:        
Unrealized gain from marketable equity investments, net of income taxes 6
Comprehensive income $ 894 $ 368 $ 4,368 $ 633
Basic net income per share:        
Income from continuing operations $ 0.17 $ 0.12 $ 1.02 $ 0.22
Income (loss) from discontinued operations 0.05 (0.03) 0.06 (0.07)
Net income 0.22 0.09 1.08 0.15
Diluted net income per share:        
Income from continuing operations 0.17 0.12 1.01 0.22
Income (loss) from discontinued operations 0.05 (0.03) 0.06 (0.07)
Net income $ 0.22 $ 0.09 $ 1.07 $ 0.15
Weighted average common shares outstanding:        
Basic 4,021 4,151 4,047 4,145
Diluted 4,055 4,195 4,085 4,169
Common shares outstanding 4,014 4,152 4,014 4,152