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 (loss)				1,201,886			1,201,886
Other comprehensive income, net of tax			3,766				3,766
Total comprehensive (loss) income							1,205,652
Stock options exercised		179,039			$ 127,042		306,081
Stock options exercised, shares	15,399				(15,399)
Stock-based compensation		124,972					124,972
Dividends paid on common stock				(4,144,075)			(4,144,075)
Balance, ending at Mar. 31, 2019	$ 1,009,958	18,505,702	(2,583)	19,474,211	$ (7,591,793)	(421,453)	30,974,042
Balance, ending, common shares at Mar. 31, 2019	2,402,523				627,351
Balance, beginning at Dec. 31, 2018	$ 1,009,958	18,403,798	(4,095)	19,145,095	$ (7,642,943)	(421,453)	30,490,360
Balance, beginning, shares at Dec. 31, 2018	2,396,323				633,551
Net income (loss)				922,456			922,456
Other comprehensive income, net of tax			1,512				1,512
Total comprehensive (loss) income							923,968
Stock options exercised		54,808			$ 51,150		105,958
Stock options exercised, shares	6,200				(6,200)
Stock-based compensation		47,096					47,096
Dividends paid on common stock				(593,340)			(593,340)
Balance, ending at Mar. 31, 2019	$ 1,009,958	18,505,702	(2,583)	19,474,211	$ (7,591,793)	(421,453)	30,974,042
Balance, ending, common shares at Mar. 31, 2019	2,402,523				627,351
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 (loss)				206,975			$ 206,975
Other comprehensive income, net of tax			972				972
Total comprehensive (loss) income							207,947
Stock options exercised		51,300			$ 29,700		$ 81,000
Stock options exercised, shares	3,600				(3,600)		3,600
Stock-based compensation		141,450					$ 141,450
Dividends paid on common stock				(1,791,094)			(1,791,094)
Purchase of treasury stock					$ (47,949)		(47,949)
Purchase of treasury stock, shares	(2,180)				2,180
Balance, ending at Mar. 31, 2020	$ 1,009,958	18,924,725	(327)	18,438,013	$ (7,650,805)	(204,706)	$ 30,516,858
Balance, ending, common shares at Mar. 31, 2020	2,402,633				627,241		2,402,633
Balance, beginning at Dec. 31, 2019	$ 1,009,958	18,858,202	(1,457)	19,138,895	$ (7,664,005)	(204,706)	$ 31,136,887
Balance, beginning, shares at Dec. 31, 2019	2,401,033				628,841
Net income (loss)				(103,765)			(103,765)
Other comprehensive income, net of tax			1,130				1,130
Total comprehensive (loss) income							(102,635)
Stock options exercised		17,520			$ 13,200		30,720
Stock options exercised, shares	1,600				(1,600)
Stock-based compensation		49,003					49,003
Dividends paid on common stock				(597,117)			(597,117)
Balance, ending at Mar. 31, 2020	$ 1,009,958	$ 18,924,725	$ (327)	$ 18,438,013	$ (7,650,805)	$ (204,706)	$ 30,516,858
Balance, ending, common shares at Mar. 31, 2020	2,402,633				627,241		2,402,633