Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities:
Net income	$ 206,975	$ 1,201,886
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Bad debt expense		69,010
Stock-based compensation	141,450	124,972
Depreciation	429,543	397,965
ESOP compensation expense	239,061	297,670
Loss on disposal of assets	3,757
Deferred income tax (benefit) expense	(22,533)	137,035
Changes in assets and liabilities:
Decrease (increase) in trade receivable, net	5,888,644	(3,642,605)
(Increase) decrease in income taxes receivable	(79,469)	35,956
Increase in inventories, net	(3,871,109)	(3,539,511)
(Increase) decrease in prepaid expenses and other current assets	(264,460)	924,361
(Decrease) increase in accounts payable	(624,350)	115,902
Increase (decrease) in accrued salaries and wages	62,523	(236,821)
(Decrease) increase in vacation accrual	(1,064)	75,501
Decrease in ESOP payable	(10,625)	(51,041)
Increase in other accrued expenses	81,851	39,234
(Decrease) increase in payroll and other taxes withheld	(1,323)	8,219
Increase (decrease) in contract liabilities	2,785,721	(81,989)
Decrease in income taxes payable	(30,481)
Net cash provided by (used in) operating activities	4,934,111	(4,124,256)
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(210,527)	(538,550)
Purchase of investment securities	(7,981,580)	(3,891,435)
Proceeds from sale/maturity of investment securities	7,943,837	9,581,630
Net cash (used in) provided by investing activities	(248,270)	5,151,645
Cash Flows from Financing Activities:
Dividends on common stock	(1,791,094)	(4,144,075)
Purchase of treasury stock	(47,949)
Proceeds from exercise of stock options	81,000	306,081
Net cash used in financing activities	(1,758,043)	(3,837,994)
Increase (decrease) in cash and cash equivalents	2,927,798	(2,810,605)
Cash and cash equivalents, beginning of period	1,462,761	4,298,796
Cash and cash equivalents, end of period	4,390,559	1,488,191
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 171,720	$ 80,000