Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 310,740	$ 279,430
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Bad debt expense		69,010
Stock-based compensation	92,447	77,876
Depreciation	286,549	256,186
ESOP compensation expense	165,820	203,809
Deferred income tax (benefit) expense	(18,561)	91,220
Changes in assets and liabilities:
Decrease (increase) in trade receivable, net	6,574,172	(1,339,155)
Increase in income taxes receivable	(43,903)	(116,081)
Increase in inventories, net	(2,363,114)	(4,326,042)
(Increase) decrease in prepaid expenses and other current assets	(512,667)	1,122,186
(Decrease) increase in accounts payable	(246,984)	784,204
Increase (decrease) in accrued salaries and wages	54,249	(35,294)
(Decrease) increase in vacation accrual	(72,161)	8,079
Decrease in ESOP payable	(7,084)	(43,749)
Increase in other accrued expenses	76,001	48,208
(Decrease) increase in payroll and other taxes withheld	(60,941)	1,372
Increase (decrease) in contract liabilities	1,797,286	(96,870)
Decrease in income tax payable	(30,481)
Net cash provided by (used in) operating activities	6,001,368	(3,015,611)
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(177,826)	(354,933)
Purchase of investment securities	(6,063,558)	(3,103,004)
Proceeds from sale/maturity of investment securities	6,079,747	8,837,220
Net cash (used in) provided by investing activities	(161,637)	5,379,283
Cash Flows from Financing Activities:
Dividends on common stock	(1,193,977)	(3,550,735)
Purchase of treasury stock	(47,949)
Proceeds from exercise of stock options	50,280	200,123
Net cash used in financing activities	(1,191,646)	(3,350,612)
Increase (decrease) in cash and cash equivalents	4,648,085	(986,940)
Cash and cash equivalents, beginning of period	1,462,761	4,298,796
Cash and cash equivalents, end of period	6,110,846	3,311,856
Supplemental Schedule of Cash Flow Information:
Income taxes paid	$ 151,000	$ 80,000