Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2019	Jun. 30, 2018
Allowance for doubtful accounts	$ 145,825	$ 153,220
Stockholders' equity:
Preferred stock, par value	$ .01	$ 0.01
Preferred stock, authorized	30,000,000	30,000,000
Common stock, par value	$ .01	$ 0.01
Common stock, authorized	50,000,000	50,000,000
Common stock, issued	19,793,372	19,773,548
Common stock, outstanding	19,793,372	19,773,548
Series B Preferred
Stockholders' equity:
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, authorized	550,000	550,000
Preferred stock, issued	212,403	212,403
Preferred stock, outstanding	212,403	212,403