Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities:
Net income	$ 306,061	$ 189,824
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	52,776	47,167
Depreciation	121,237	136,548
ESOP compensation expense	84,506
Deferred income tax benefit	(17,885)	(17,175)
Changes in assets and liabilities:
Decrease in trade accounts receivable	1,072,116	2,637,412
Decrease (increase) in income taxes receivable	89,667	(19,099)
Decrease (increase) in inventories	7,338	(1,162,692)
Decrease (increase) in prepaid expenses and other current assets	218,306	(251,444)
Decrease in accounts payable	(553,919)	(190,174)
Increase in accrued salaries and wages	73,348	15,711
Decrease in vacation accrual	(20,677)	(12,287)
Increase (decrease) in other accrued expenses	80,892	(157,541)
Increase in payroll and other taxes withheld	56,547	136,555
Increase in contract liabilities	17,380	72,613
Decrease in income taxes payable		(47,707)
Net cash provided by operating activities	1,587,693	1,377,711
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(45,691)	(19,807)
Purchase of investment securities	(534,000)	(292,119)
Proceeds from sale/maturity of investment securities	488,000	2,602,663
Net cash (used in) provided by investing activities	(91,691)	2,290,737
Cash Flows from Financing Activities:
Dividends on common stock
Net cash used in financing activities
Increase in cash and cash equivalents	1,496,002	3,668,448
Cash and cash equivalents, beginning of period	6,802,712	5,402,122
Cash and cash equivalents, end of period	8,298,714	9,070,570
Supplemental Schedule of Cash Flow Information:
Income taxes paid		125,250
Supplemental Schedule of Non-cash Financing Activities:
Accrual of dividends		$ 600,658