CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 15,413,000	$ 7,795,000	$ 12,481,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,697,000	1,495,000	1,409,000
Impairment of intangible asset		1,852,000
Loss on marketable securities	9,000
(Recovery of) provision for doubtful accounts	(100,000)	238,000	(26,000)
Change to inventory obsolescence reserve	(79,000)	624,000	(582,000)
Deferred income taxes	337,000	(47,000)	755,000
Stock based compensation expense	435,000	583,000	160,000
Changes in operating assets and liabilities:
Accounts receivable	(5,049,000)	2,800,000	(1,440,000)
Inventories	8,794,000	(6,793,000)	(5,991,000)
Prepaid expenses and other current assets	(359,000)	(168,000)	318,000
Other assets			(11,000)
Accounts payable, accrued expenses, accrued salaries and wages, accrued income taxes	1,889,000	1,926,000	1,580,000
Net Cash Provided by Operating Activities	22,987,000	10,305,000	8,653,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant, and equipment	(1,007,000)	(1,615,000)	(1,988,000)
Purchases of marketable securities	(5,422,000)
Net Cash Used in Investing Activities	(6,429,000)	(1,615,000)	(1,988,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt		3,904,000
Proceeds from stock option exercises		80,000	53,000
Cash paid for purchase of treasury stock		(2,454,000)	(3,998,000)
Net Cash Provided by (Used in) Financing Activities		1,530,000	(3,945,000)
Net increase in Cash and Cash Equivalents	16,558,000	10,220,000	2,720,000
CASH AND CASH EQUIVALENTS - Beginning	18,248,000	8,028,000	5,308,000
CASH AND CASH EQUIVALENTS - Ending	34,806,000	18,248,000	8,028,000
SUPPLEMENTAL CASH FLOW INFORMATION
Interest paid	18,000	29,000	23,000
Income taxes paid	$ 1,970,000	$ 749,000	262,000
Surrender of Common Shares			$ 8,000