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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]        
Net sales $ 13,079 $ 9,265 $ 35,448 $ 29,426
Cost of sales 9,268 6,407 26,058 19,737
Gross profit 3,811 2,858 9,390 9,689
Operating expenses:        
Selling expenses 24 20 146 79
General and administrative expenses 1,009 1,145 2,983 3,402
Loss on disposal of equipment 14 14
Research and development costs 713 658 2,109 2,254
Total operating expenses 1,746 1,837 5,238 5,749
Operating income 2,065 1,021 4,152 3,940
Interest expense (131) (112) (389) (349)
Unrealized gain (loss) on marketable equity investments (177) (275) 231 (427)
Interest and other income 11 235 50
Gain on sale of investments 7
Income before income taxes 1,768 634 4,236 3,214
Income tax expense (455) (172) (968) (764)
Net income $ 1,313 $ 462 $ 3,268 $ 2,450
Basic net income per share:        
Net income $ 0.37 $ 0.13 $ 0.91 $ 0.67
Diluted net income per share:        
     Net income $ 0.36 $ 0.12 $ 0.89 $ 0.65
Weighted average common shares outstanding:        
Basic 3,548 3,626 3,580 3,645
Diluted 3,623 3,749 3,656 3,774
Common shares outstanding 3,545 3,618 3,545 3,618