Statements of Cash Flows - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities:
Net (loss) income	$ (181,543)	$ 1,163,668
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Stock-based compensation	133,663	189,639
Depreciation	519,813	568,528
ESOP compensation expense	353,897	305,006
Loss on disposal of assets		4,525
Loss on inventory reduction due to contract cancellation	710,207
Deferred income tax benefit	(64,396)	(43,641)
Changes in assets and liabilities:
Decrease in trade receivables	3,659,624	1,982,378
Increase in income tax receivable	(249,602)
Increase in inventories	(4,714,044)	(1,562,918)
(Increase) decrease in prepaid expenses and other current assets	(303,411)	97,295
(Decrease) increase in accounts payable	(143,523)	701,263
Increase in accrued salaries and wages	6,466	139,311
Decrease in vacation accrual	(17,223)	(97,036)
(Decrease) increase in other accrued expenses	(192,308)	208,567
Increase in payroll and other taxes withheld	222,911	125,519
Increase in contract liabilities	902,370	2,169,181
(Decrease) increase in income taxes payable	(47,905)	17,226
Net cash provided by operating activities	594,996	5,968,511
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(43,554)	(214,421)
Purchase of investment securities	(5,436,056)	(9,338,100)
Proceeds from sale/maturity of investment securities	7,486,520	9,878,531
Net cash provided by investing activities	2,006,910	326,010
Cash Flows from Financing Activities:
Dividends paid on common stock	(1,201,316)	(2,388,211)
Purchase of treasury stock		(47,949)
Proceeds from exercise of stock options		81,000
Net cash used in financing activities	(1,201,316)	(2,355,160)
Increase in cash and cash equivalents	1,400,590	3,939,361
Cash and cash equivalents, beginning of the year	5,402,122	1,462,761
Cash and cash equivalents, end of the year	6,802,712	5,402,122
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 175,250	$ 172,475