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, 2017	$ 1,009,958	$ 17,650,335	$ (3,599)	$ 21,670,196	$ (7,779,099)	$ (650,248)	$ 31,897,543
Balance, beginning, shares at Jun. 30, 2017	2,371,321				658,553		2,371,321
Net income				3,075,797			$ 3,075,797
Other comprehensive loss, net of tax			(2,750)				(2,750)
Total comprehensive income							3,073,047
Stock options exercised		269,157			$ 169,958		$ 439,115
Stock options exercised, shares	20,601				(20,601)		20,601
Stock-based compensation		123,112					$ 123,112
Dividends paid on common stock $1.00, $2.00 per share				(2,329,593)			(2,329,593)
Purchase of treasury stock					$ (109,694)		(109,694)
Purchase of treasury stock, shares	(4,798)				4,798
Reduction of unearned ESOP shares		159,087				228,795	387,882
Balance, ending at Jun. 30, 2018	$ 1,009,958	18,201,691	(6,349)	22,416,400	$ (7,718,835)	(421,453)	$ 33,481,412
Balance, ending, common shares at Jun. 30, 2018	2,387,124				642,750		2,387,124
Net income				2,342,694			$ 2,342,694
Other comprehensive 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)		15,899
Stock-based compensation		172,148					$ 172,148
Dividends paid on common stock $1.00, $2.00 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