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CONSOLIDATED INCOME STATEMENTS - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]    
Net sales $ 42,041 $ 38,029
Cost of sales 28,909 24,454
Gross profit 13,132 13,575
Operating expenses:    
Selling expenses 91 590
General and administrative expenses 4,903 4,076
Loss on disposal of equipment 35
Research and development costs 2,980 4,384
Total operating expenses 8,009 9,050
Operating income 5,123 4,525
Other income (expense):    
Interest and dividend income 76 126
Unrealized gain (loss) on marketable equity investments (57) 1,371
Gain on sale of investments 28 1,327
Interest expense (464) (352)
Total other income (expense) (417) 2,472
Income before income taxes 4,706 6,997
Income tax expense 851 1,176
Net income $ 3,855 $ 5,821
Basic & Diluted income per share:    
Basic net income per share $ 1.06 $ 1.53
Diluted net income per share $ 1.02 $ 1.48
Weighted-average common shares outstanding:    
Basic 3,635,894 3,796,516
Diluted 3,763,345 3,936,194