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Condensed Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]        
Net revenues $ 12,068,000 $ 10,141,000 $ 34,455,000 $ 30,390,000
Cost of revenues 3,012,000 2,398,000 8,386,000 7,066,000
Gross profit 9,056,000 7,743,000 26,069,000 23,324,000
Operating expenses        
Selling, general and administrative 7,694,000 6,544,000 22,937,000 19,806,000
Research and development 166,000 336,000 618,000 1,041,000
Total operating expenses 7,860,000 6,880,000 23,555,000 20,847,000
Operating income 1,196,000 863,000 2,514,000 2,477,000
Interest income, net 26,000 6,000 37,000 21,000
Net income before income taxes 1,222,000 869,000 2,551,000 2,498,000
Income tax expense 147,000 224,000 418,000 576,000
Net income $ 1,075,000 $ 645,000 $ 2,133,000 $ 1,922,000
Income per share:        
Basic $ 0.13 $ 0.08 $ 0.25 $ 0.23
Diluted $ 0.12 $ 0.07 $ 0.25 $ 0.22
Weighted-average common shares outstanding:        
Basic 8,461,531 8,454,504 8,449,623 8,485,856
Diluted 8,710,106 8,744,535 8,694,407 8,762,963