Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net income	$ 189,824	$ 81,776
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	47,167	47,176
Depreciation	136,548	142,798
ESOP compensation expense		87,833
Deferred income tax benefit	(17,175)	(8,688)
Changes in assets and liabilities:
Decrease in trade accounts receivable, net	2,637,412	4,346,797
Increase in income tax receivable	(19,099)	(93,981)
Increase in inventories, net	(1,162,692)	(1,612,900)
(Increase) decrease in prepaid expenses and other current assets	(251,444)	230,260
Decrease in accounts payable	(190,174)	(83,979)
Increase in accrued salaries and wages	15,711	102,634
Decrease in vacation accrual	(12,287)	(111,016)
Decrease in ESOP payable		(3,542)
Decrease in other accrued expenses	(157,541)	(25,245)
Increase (decrease) in payroll and other taxes withheld	136,555	(651)
Increase in contract liabilities	72,613	660,780
Decrease in income taxes payable	(47,707)	(30,481)
Net cash provided by operating activities	1,377,711	3,729,571
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(19,807)	(94,070)
Purchase of investment securities	(292,119)	(2,468,751)
Proceeds from sale/maturity of investment securities	2,602,663	2,581,496
Net cash provided by investing activities	2,290,737	18,675
Cash Flows from Financing Activities:
Dividends on common stock		(597,260)
Purchase of treasury stock		(8,291)
Proceeds from exercise of stock options		50,280
Net cash used in financing activities		(555,271)
Increase in cash and cash equivalents	3,668,448	3,192,975
Cash and cash equivalents, beginning of period	5,402,122	1,462,761
Cash and cash equivalents, end of period	9,070,570	4,655,736
Supplemental Schedule of Cash Flow Information:
Income taxes paid	125,250	151,000
Supplemental Schedule of Non-cash Financing Activities
Accrual of dividends	$ 600,658