Note 6 - (Loss) Income Per Common and Common Stock Equivalent Share - Earning Per Share (Details) - USD ($)	3 Months Ended			6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	[2]	Dec. 31, 2019	Dec. 31, 2018	[2]
Net (loss) income	$ (215,713)	$ 103,149	[1]	$ (526,462)	$ 144,719	[1],[3]
Weighted average shares, basic (in shares)	7,404,831	7,404,831	[1]	7,404,831	7,397,291	[1]
Dilutive effect of stock compensation awards (in shares)		8,560			26,226
Diluted shares (in shares)	7,404,831	7,413,391	[1]	7,404,831	7,423,517	[1]
Basic (in dollars per share)	$ (0.03)	$ 0.01	[1]	$ (0.07)	$ 0.02	[1]
Diluted (in dollars per share)	$ (0.03)	$ 0.01	[1]	$ (0.07)	$ 0.02	[1]

[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)