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Condensed Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]        
Net revenues $ 8,786,972 $ 8,743,897 $ 26,287,217 $ 25,593,337
Cost of revenues 2,086,120 2,150,347 5,912,900 5,981,931
Gross profit 6,700,852 6,593,550 20,374,317 19,611,406
Operating expenses        
Selling, general and administrative 6,050,666 5,288,485 16,489,871 15,148,344
Research and development 407,199 391,962 1,395,755 634,376
Total operating expenses 6,457,865 5,680,447 17,885,626 15,782,720
Operating income 242,987 913,103 2,488,691 3,828,686
Interest income, net 9,784 34,171 28,769 111,200
Net income before income taxes 252,771 947,274 2,517,460 3,939,886
Income tax expense 29,000 294,000 555,000 1,087,000
Net income $ 223,771 $ 653,274 $ 1,962,460 $ 2,852,886
Income per share:        
Basic (in dollars per share) $ 0.03 $ 0.08 $ 0.23 $ 0.34
Diluted (in dollars per share) $ 0.03 $ 0.07 $ 0.22 $ 0.33
Weighted-average common shares outstanding:        
Basic (in shares) 8,576,523 8,403,154 8,565,839 8,390,916
Diluted (in shares) 8,907,045 8,880,794 8,921,494 8,759,493