Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 2,057,635	$ 664,904
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefits from share-based compensation		(8,066)
Stock-based compensation	50,470	53,048
Depreciation	211,193	216,628
ESOP compensation expense	179,038	216,876
Deferred income tax expense	6,565	34,481
Changes in assets and liabilities:
(Increase) decrease in trade receivable, net	(2,158,887)	1,204,622
Decrease in inventories, net	736,921	1,391,132
(Increase) decrease in prepaid expenses and other current assets	(25,471)	132,175
Decrease in accounts payable	(953,181)	(116,652)
Increase (decrease) in accrued salaries and wages	232,337	(177,939)
Decrease in vacation accrual	(26,291)	(21,210)
Decrease in ESOP payable	(22,500)	(30,833)
Decrease in other accrued expenses	(129,873)	(94,452)
Increase in payroll and other taxes withheld	3,757	3,512
Increase in income tax payable	435,131	21,136
Net cash provided by operating activities	596,844	3,489,362
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(185,190)	(223,211)
Purchase of investment securities	(4,696,925)	(6,232,932)
Proceeds from sale/maturity of investment securities	2,701,431	2,845,017
Net cash used in investing activities	(2,180,684)	(3,611,126)
Cash Flows from Financing Activities:
Dividends on common stock	(1,162,382)	(1,152,618)
Purchase of treasury stock	(109,694)	(44,335)
Proceeds from exercise of stock options		136,285
Excess tax benefits from share-based compensation		8,066
Net cash used in financing activities	(1,272,076)	(1,052,602)
Decrease in cash and cash equivalents	(2,855,916)	(1,174,366)
Cash and cash equivalents, beginning of period	10,058,163	10,031,644
Cash and cash equivalents, end of period	7,202,247	8,857,278
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 260,000	$ 218,000