Consolidated Balance Sheets (Parentheticals) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Accounts receivable, allowance for doubtful accounts	$ 74,082	$ 2,617	[1]
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	7,404,831	7,382,706
Common stock, shares outstanding (in shares)	7,404,831	7,382,706

[1] Excludes approximately 2,786,225 and 2,523,513 stock options for the years ended June 30, 2020 and 2019, respectively, as the impact of such awards was anti-dilutive.