Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 2,375,399	$ 944,076
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefits from share-based compensation		(9,070)
Stock-based compensation	86,675	93,293
Depreciation	318,076	323,710
ESOP compensation expense	279,502	320,835
Deferred income tax expense	19,707	50,146
Changes in assets and liabilities:
(Increase) decrease in trade receivable, net	(195,828)	1,583,208
(Increase) decrease in income taxes receivable	(27,923)	107,615
(Increase) decrease in inventories, net	(622,344)	1,891,249
Increase in prepaid expenses and other current assets	(549,141)	(123,758)
(Decrease) increase in accounts payable	(750,220)	82,715
Increase (decrease) in accrued salaries and wages	219,168	(258,947)
Increase in vacation accrual	68,463	16,874
Decrease in ESOP payable	(33,750)	(46,250)
Decrease in other accrued expenses	(86,865)	(40,020)
Increase (decrease) in payroll and other taxes withheld	11,490	(2,531)
Net cash provided by operating activities	1,112,409	4,933,145
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(632,023)	(331,686)
Purchase of investment securities	(10,101,613)	(7,606,900)
Proceeds from sale/maturity of investment securities	8,121,986	3,974,224
Net cash used in investing activities	(2,611,650)	(3,964,362)
Cash Flows from Financing Activities:
Dividends on common stock	(1,744,062)	(1,730,031)
Purchase of treasury stock	(109,694)	(44,335)
Proceeds from exercise of stock options	201,586	150,917
Excess tax benefits from share-based compensation		9,070
Net cash used in financing activities	(1,652,170)	(1,614,379)
Decrease in cash and cash equivalents	(3,151,411)	(645,596)
Cash and cash equivalents, beginning of period	10,058,163	10,031,644
Cash and cash equivalents, end of period	6,906,752	9,386,048
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 810,000	$ 228,000