Note 6 - (Loss) Income Per Common and Common Stock Equivalent Share - Earning Per Share (Details) - USD ($)	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	[1]
Net (loss) income	$ (310,749)	$ 41,570	[2],[3]
Weighted average shares, basic (in shares)	7,404,831	7,389,751	[3]
Dilutive effect of stock compensation awards (in shares)		94,115
Diluted shares (in shares)	7,404,831	7,483,866	[3]
Basic (in dollars per share)	$ (0.04)	$ 0.01	[3]
Diluted (in dollars per share)	$ (0.04)	$ 0.01	[3]

[1] As adjusted for change in accounting principle (Note 2)

[2] As adjusted for change in accounting principle (Note 2)

[3] As adjusted for change in accounting principle (Note 2)