Statements of Cash Flows - USD ($)	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 944,076	$ 2,465,425
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefits from share-based compensation	(9,070)	(15,021)
Stock-based compensation	93,293	74,533
Depreciation	323,710	324,745
ESOP compensation expense	320,835	334,031
Loss on disposal of assets		147
Deferred income tax expense	50,146	55,656
Changes in assets and liabilities:
Decrease in trade receivable, net	1,583,208	1,841,984
Decrease (increase) income taxes receivable	107,615	(172,459)
Decrease in inventories, net	1,891,249	185,130
Increase in prepaid expenses and other current assets	(123,758)	(48,825)
Increase (decrease) in accounts payable	82,715	(303,595)
Decrease in accrued salaries and wages	(258,947)	(26,110)
Increase in vacation accrual	16,874	42,273
Decrease in ESOP payable	(46,250)	(79,166)
Decrease in other accrued expenses	(40,020)	(247,038)
(Decrease) increase in payroll and other taxes withheld	(2,531)	3,773
Increase in income taxes payable		12,305
Net cash provided by operating activities	4,933,145	4,447,788
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(331,686)	(140,340)
Purchase of investment securities	(7,606,900)	(3,575,584)
Proceeds from sale/maturity of investment securities	3,974,224	2,343,942
Net cash used in investing activities	(3,964,362)	(1,371,982)
Cash Flows from Financing Activities:
Dividends on common stock	(1,730,031)	(2,279,895)
Purchase of treasury stock	(44,335)	(355,418)
Proceeds from exercise of stock options	150,917	232,882
Excess tax benefits from share-based compensation	9,070	15,021
Net cash used in financing activities	(1,614,379)	(2,387,410)
(Decrease) increase in cash and cash equivalents	(645,596)	688,396
Cash and cash equivalents, beginning of period	10,031,644	8,859,405
Cash and cash equivalents, end of period	9,386,048	9,547,801
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 228,000	$ 1,143,000