Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2021	Jun. 30, 2020
Allowance for doubtful accounts	$ 234,693	$ 251,954
Stockholders' equity:
Common stock, par value	$ .01	$ .01
Common stock, authorized	50,000,000	50,000,000
Common stock, issued	19,351,935	19,484,485
Common stock, outstanding	19,351,935	19,484,485
Series B Preferred
Stockholders' equity:
Preferred stock, par value	$ .01	$ 0.01
Preferred stock, authorized	700,000	700,000
Preferred stock, issued	625,375	625,375
Preferred stock, outstanding	625,375	625,375
Series B-1 Preferred
Stockholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	550,000	550,000
Preferred stock, issued	212,402	212,402
Preferred stock, outstanding	212,402	212,402