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Condensed Statements of Shareholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance at beginning at Jun. 30, 2019 $ 84,084 $ 16,127,826 $ 9,522,064 $ 25,733,974
Balance at beginning (in shares) at Jun. 30, 2019 8,408,351      
Increase (Decrease) in Stockholders' Equity        
Net income     1,014,556 1,014,556
Issuance of restricted stock $ 325 (325)    
Issuance of restricted stock (in shares) 32,500      
Issuance of common stock upon exercise of options $ 50 12,990   13,040
Issuance of common stock upon exercise of options (in shares) 5,000      
Share-based compensation expense   209,954   209,954
Balance at ending at Sep. 30, 2019 $ 84,459 16,350,445 10,536,620 26,971,524
Balance at ending (in shares) at Sep. 30, 2019 8,445,851      
Balance at beginning at Jun. 30, 2019 $ 84,084 16,127,826 9,522,064 25,733,974
Balance at beginning (in shares) at Jun. 30, 2019 8,408,351      
Increase (Decrease) in Stockholders' Equity        
Net income       2,852,886
Balance at ending at Mar. 31, 2020 $ 84,838 16,867,053 12,374,950 29,326,841
Balance at ending (in shares) at Mar. 31, 2020 8,483,785      
Balance at beginning at Sep. 30, 2019 $ 84,459 16,350,445 10,536,620 26,971,524
Balance at beginning (in shares) at Sep. 30, 2019 8,445,851      
Increase (Decrease) in Stockholders' Equity        
Net income     1,185,056 1,185,056
Issuance of restricted stock $ 150 (150)    
Issuance of restricted stock (in shares) 15,000      
Issuance of common stock upon exercise of options $ 175 62,721   62,896
Issuance of common stock upon exercise of options (in shares) 17,597      
Share-based compensation expense   234,304   234,304
Balance at ending at Dec. 31, 2019 $ 84,784 16,647,320 11,721,676 28,453,780
Balance at ending (in shares) at Dec. 31, 2019 8,478,448      
Increase (Decrease) in Stockholders' Equity        
Net income 653,274 653,274
Issuance of common stock upon exercise of options $ 54 (12,567) (12,513)
Issuance of common stock upon exercise of options (in shares) 5,337      
Share-based compensation expense 232,300 232,300
Balance at ending at Mar. 31, 2020 $ 84,838 16,867,053 12,374,950 29,326,841
Balance at ending (in shares) at Mar. 31, 2020 8,483,785      
Balance at beginning at Jun. 30, 2020 $ 85,678 16,480,134 13,683,503 $ 30,249,315
Balance at beginning (in shares) at Jun. 30, 2020 8,567,834     8,567,834
Increase (Decrease) in Stockholders' Equity        
Net income     535,262 $ 535,262
Issuance of restricted stock $ 191 (191)    
Issuance of restricted stock (in shares) 19,090      
Issuance of common stock upon exercise of options $ 193 (193)    
Issuance of common stock upon exercise of options (in shares) 19,256      
Taxes paid on net share settlement of stock option exercises   (119,664)   (119,664)
Share-based compensation expense   191,103   191,103
Balance at ending at Sep. 30, 2020 $ 86,062 16,551,189 14,218,765 30,856,016
Balance at ending (in shares) at Sep. 30, 2020 8,606,180      
Balance at beginning at Jun. 30, 2020 $ 85,678 16,480,134 13,683,503 $ 30,249,315
Balance at beginning (in shares) at Jun. 30, 2020 8,567,834     8,567,834
Increase (Decrease) in Stockholders' Equity        
Net income       $ 1,962,460
Balance at ending at Mar. 31, 2021 $ 86,374 17,140,274 15,645,963 $ 32,872,611
Balance at ending (in shares) at Mar. 31, 2021 8,637,420     8,637,420
Balance at beginning at Sep. 30, 2020 $ 86,062 16,551,189 14,218,765 $ 30,856,016
Balance at beginning (in shares) at Sep. 30, 2020 8,606,180      
Increase (Decrease) in Stockholders' Equity        
Net income     1,203,427 1,203,427
Issuance of restricted stock $ 180 (180)    
Issuance of restricted stock (in shares) 18,000      
Issuance of common stock upon exercise of options $ 108 45,561   45,669
Issuance of common stock upon exercise of options (in shares) 10,865      
Taxes paid on net share settlement of stock option exercises   (10,051)   (10,051)
Share-based compensation expense   238,673   238,673
Balance at ending at Dec. 31, 2020 $ 86,350 16,825,192 15,422,192 32,333,734
Balance at ending (in shares) at Dec. 31, 2020 8,635,045      
Increase (Decrease) in Stockholders' Equity        
Net income     223,771 223,771
Issuance of common stock upon exercise of options $ 24 (24)    
Issuance of common stock upon exercise of options (in shares) 2,375      
Taxes paid on net share settlement of stock option exercises   (11,117)   (11,117)
Share-based compensation expense   326,223   326,223
Balance at ending at Mar. 31, 2021 $ 86,374 $ 17,140,274 $ 15,645,963 $ 32,872,611
Balance at ending (in shares) at Mar. 31, 2021 8,637,420     8,637,420