Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 30, 2022	Mar. 31, 2021	Mar. 30, 2021
Cash Flows From Operating Activities:
Net income	$ 1,522,000	$ 1,522,000	$ 3,719,000	$ 3,719,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Stock-based compensation	55,000		101,000
Depreciation and amortization	212,000	212,000	198,000	198,000
Equity in income of unconsolidated affiliate	(49,000)	(49,000)	(322,000)	(322,000)
Operating lease expense, net of accretion	228,000		220,000
Changes in operating assets and liabilities:
Accounts receivable, net	(3,814,000)		1,384,000
Accounts receivable, related party	(214,000)		(370,000)
Inventories	1,086,000		(2,029,000)
Prepaid expenses	736,000		(4,011,000)
Accounts payable and accrued liabilities	(714,000)		(1,795,000)
Customer advance payments of orders	0		(96,000)
Lease liabilities	(227,000)		(219,000)
Net cash used in operating activities	(1,179,000)		(3,220,000)
Cash Flows From Investing Activities:
Purchases of property and equipment	(133,000)		(130,000)
Net cash used in investing activities	(133,000)		(130,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	0		308,000
Repurchase of common stock	(756,000)		(2,366,000)
Net cash used in financing activities	(756,000)		(2,058,000)
Decrease in cash and cash equivalents	(2,068,000)		(5,408,000)
Cash and cash equivalents, beginning of the period	16,307,000	$ 16,307,000	23,292,000	$ 23,292,000
Cash and cash equivalents, end of the period	$ 14,239,000		$ 17,884,000