Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities:
Net income	$ 2,215,000	$ 5,390,000
Adjustments to reconcile net income to net cash and cash equivalents provided by (used in) operating activities:
Stock-based compensation	87,000	169,000
Depreciation and amortization	439,000	401,000
Equity in income of unconsolidated affiliate	(99,000)	(510,000)
Operating lease expense, net of accretion	457,000	441,000
Changes in operating assets and liabilities:
Accounts receivable, net	(3,055,000)	2,053,000
Accounts receivable, related party	(214,000)	(92,000)
Inventories	1,812,000	(5,248,000)
Prepaid expenses	(175,000)	(2,135,000)
Accounts payable and accrued liabilities	(67,000)	(2,894,000)
Customer advance payments of orders	0	(106,000)
Lease liabilities	(457,000)	(438,000)
Net cash provided by (used in) operating activities	943,000	(2,969,000)
Cash Flows From Investing Activities:
Purchases of property and equipment	(222,000)	(1,468,000)
Net cash used in investing activities	(222,000)	(1,468,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	30,000	391,000
Repurchase of common stock	(1,716,000)	(3,708,000)
Net cash used in financing activities	(1,686,000)	(3,317,000)
Decrease in cash and cash equivalents	(965,000)	(7,754,000)
Cash and cash equivalents, beginning of the period	16,307,000	23,292,000
Cash and cash equivalents, end of the period	$ 15,342,000	$ 15,538,000