Statements of Cash Flows - USD ($)	3 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 420,825	$ 878,530
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefits from share-based compensation		(15,021)
Stock-based compensation	23,333	30,466
Depreciation	108,131	110,199
ESOP compensation expense	108,709	113,094
Loss on disposal of assets		8
Deferred income tax expense	12,504	16,789
Changes in assets and liabilities:
Decrease in trade receivable, net	1,066,287	2,575,057
Decrease in income taxes receivable	45,775
Decrease (increase) in inventories, net	396,501	(867,509)
Decrease (increase) in prepaid expenses and other current assets	17,321	(39,726)
Increase in accounts payable	323,651	97,343
Decrease in accrued salaries and wages	(5,268)	(45,188)
Increase (decrease) in vacation accrual	(37,369)	(38,930)
Decrease in ESOP payable	(15,417)	(19,792)
Decrease in other accrued expenses	(58,990)	(146,152)
(Decrease) increase in payroll and other taxes withheld	(1,234)	1,267
Increase in income taxes payable		300,707
Net cash provided by operating activities	2,404,759	2,951,142
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(155,730)	(5,751)
Purchase of investment securities	(4,391,056)	(1,284,178)
Proceeds from sale/maturity of investment securities	1,256,350	448,900
Net cash used in investing activities	(3,290,436)	(841,029)
Cash Flows from Financing Activities:
Dividends on common stock	(575,754)	(570,880)
Proceeds from exercise of stock options		13,888
Excess tax benefits from share-based compensation		15,021
Net cash used in financing activities	(575,754)	(541,971)
(Decrease) increase in cash and cash equivalents	(1,461,431)
Cash and cash equivalents, beginning of period	10,031,644	8,859,405
Cash and cash equivalents, end of period	8,570,213	10,427,547
Supplemental Schedule of Cash Flow Information:
Income taxes paid	111,000	50,000
Supplemental Schedule of Non-cash Financing Activities:
Accrual of dividends		$ 590,872

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration