Statements of Cash Flows - USD ($)	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net income	$ 3,075,797	$ 1,135,736
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefits from share-based compensation		(9,070)
Tax effect of dividends on unallocated ESOP shares		20,967
Stock-based compensation	123,112	129,167
Depreciation	429,679	435,557
ESOP compensation expense	387,882	417,419
Loss on disposal of assets		4
Deferred income tax expense (benefit)	115,075	(46,488)
Changes in assets and liabilities:
(Increase) decrease in trade receivables, net	(978,113)	1,557,851
(Increase) decrease in income tax receivable	(41,796)	218,189
(Increase) decrease in inventories, net	(1,627,191)	1,054,870
Increase in prepaid expenses and other current assets	(1,065,269)	(7,618)
(Decrease) increase in accounts payable	(427,518)	1,697,328
Increase (decrease) in accrued salaries and wages	356,960	(185,865)
Increase (decrease) in vacation accrual	51,413	(48,562)
(Decrease) increase in other accrued expenses	(145,620)	53,652
Increase (decrease) in payroll and other taxes withheld	6,496	(2,414)
Net cash provided by operating activities	260,907	6,420,723
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(1,923,220)	(352,132)
Purchase of investment securities	(11,199,339)	(8,922,097)
Proceeds from sale/maturity of investment securities	9,102,457	5,071,818
Net cash used in investing activities	(4,020,102)	(4,202,411)
Cash Flows from Financing Activities:
Dividends paid on common stock	(2,329,593)	(2,307,445)
Purchase of treasury stock	(109,694)	(44,335)
Proceeds from exercise of stock options	439,115	150,917
Excess tax benefits from share-based compensation		9,070
Net cash used in financing activities	(2,000,172)	(2,191,793)
(Decrease) increase in cash and cash equivalents	(5,759,367)	26,519
Cash and cash equivalents, beginning of the year	10,058,163	10,031,644
Cash and cash equivalents, end of the year	4,298,796	10,058,163
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 920,000	$ 323,000

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Name:	us-gaap_ProceedsFromStockOptionsExercised
Namespace Prefix:	us-gaap_
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