Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Unearned ESOP Shares [Member]	Total
Balance, beginning at Jun. 30, 2018	$ 1,009,958	$ 18,201,691	$ (6,349)	$ 22,416,400	$ (7,718,835)	$ (421,453)	$ 33,481,412
Balance, beginning, shares at Jun. 30, 2018	2,387,124				642,750
Net income				279,430			279,430
Other comprehensive income, net of tax			2,254				2,254
Total comprehensive income							281,684
Stock options exercised		124,231			$ 75,892		200,123
Stock options exercised, shares	9,199				(9,199)
Stock-based compensation		77,876					77,876
Dividends paid on common stock				(3,550,735)			(3,550,735)
Balance, ending at Dec. 31, 2018	$ 1,009,958	18,403,798	(4,095)	19,145,095	$ (7,642,943)	(421,453)	30,490,360
Balance, ending, common shares at Dec. 31, 2018	2,396,323				633,551
Balance, beginning at Sep. 30, 2018	$ 1,009,958	18,363,293	(5,002)	19,482,668	$ (7,642,943)	(421,453)	30,786,521
Balance, beginning, shares at Sep. 30, 2018	2,396,323				633,551
Net income				217,758			217,758
Other comprehensive income, net of tax			907				907
Total comprehensive income							218,665
Stock-based compensation		40,505					40,505
Dividends paid on common stock				(555,331)			(555,331)
Balance, ending at Dec. 31, 2018	$ 1,009,958	18,403,798	(4,095)	19,145,095	$ (7,642,943)	(421,453)	30,490,360
Balance, ending, common shares at Dec. 31, 2018	2,396,323				633,551
Balance, beginning at Jun. 30, 2019	$ 1,009,958	18,731,975	(1,299)	20,022,132	$ (7,632,556)	(204,706)	$ 31,925,504
Balance, beginning, shares at Jun. 30, 2019	2,401,213				628,661		2,401,213
Net income				310,740			$ 310,740
Other comprehensive income, net of tax			(158)				(158)
Total comprehensive income							310,582
Stock options exercised		33,780			$ 16,500		$ 50,280
Stock options exercised, shares	2,000				(2,000)		2,000
Stock-based compensation		92,447					$ 92,447
Dividends paid on common stock				(1,193,977)			(1,193,977)
Purchase of treasury stock					$ (47,949)		(47,949)
Purchase of treasury stock, shares	(2,180)				2,180
Balance, ending at Dec. 31, 2019	$ 1,009,958	18,858,202	(1,457)	19,138,895	$ (7,664,005)	(204,706)	$ 31,136,887
Balance, ending, common shares at Dec. 31, 2019	2,401,033				628,841		2,401,033
Balance, beginning at Sep. 30, 2019	$ 1,009,958	18,812,931	(1,102)	19,506,648	$ (7,624,347)	(204,706)	$ 31,499,382
Balance, beginning, shares at Sep. 30, 2019	2,402,880				626,994
Net income				228,964			228,964
Other comprehensive income, net of tax			(355)				(355)
Total comprehensive income							228,609
Stock-based compensation		45,271					45,271
Dividends paid on common stock				(596,717)			(596,717)
Purchase of treasury stock					$ (39,658)		(39,658)
Purchase of treasury stock, shares	(1,847)				1,847
Balance, ending at Dec. 31, 2019	$ 1,009,958	$ 18,858,202	$ (1,457)	$ 19,138,895	$ (7,664,005)	$ (204,706)	$ 31,136,887
Balance, ending, common shares at Dec. 31, 2019	2,401,033				628,841		2,401,033