Statements of Changes in Stockholders' Equity - 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		2,387,124
Net income				2,342,694			$ 2,342,694
Other comprehensive income loss, net of tax			5,050				5,050
Total comprehensive income							2,347,744
Stock options exercised		184,514			$ 131,167		315,681
Stock options exercised, shares	15,899				(15,899)
Stock-based compensation		172,148					172,148
Dividends paid on common stock per share				(4,736,962)			(4,736,962)
Purchase of treasury stock					$ (44,888)		(44,888)
Purchase of treasury stock, shares	(1,810)				1,810
Reduction of unearned ESOP shares		173,622				216,747	390,369
Balance, ending at Jun. 30, 2019	$ 1,009,958	18,731,975	(1,299)	20,022,132	$ (7,632,556)	(204,706)	$ 31,925,504
Balance, ending, common shares at Jun. 30, 2019	2,401,213				628,661		2,401,213
Net income				1,163,668			$ 1,163,668
Other comprehensive income loss, net of tax			(1,808)				(1,808)
Total comprehensive income							1,161,860
Stock options exercised		51,300			$ 29,700		$ 81,000
Stock options exercised, shares	3,600				(3,600)		3,600
Stock-based compensation		189,639					$ 189,639
Dividends paid on common stock per share				(2,388,211)			(2,388,211)
Purchase of treasury stock					$ (47,949)		(47,949)
Purchase of treasury stock, shares	(2,180)				2,180
Reduction of unearned ESOP shares		100,299				204,706	305,005
Balance, ending at Jun. 30, 2020	$ 1,009,958	$ 19,073,213	$ (3,107)	$ 18,797,589	$ (7,650,805)		$ 31,226,848
Balance, ending, common shares at Jun. 30, 2020	2,402,633				627,241		2,402,633