Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities:
Net income	$ 6,756,000	$ 26,888,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Share-based compensation	315,000	375,000
Depreciation and amortization	817,000	729,000
Loss on marketable securities	0	62,000
Equity in income of unconsolidated affiliate	(571,000)	(710,000)
Operating lease expense, net of accretion	887,000	(357,000)
Deferred income taxes	228,000	47,000
Changes in assets and liabilities:
Accounts receivable, net	4,735,000	(4,564,000)
Accounts receivable, related party	(478,000)	(181,000)
Inventories	(8,220,000)	(5,446,000)
Prepaid expenses	(856,000)	(2,500,000)
Accounts payable and accrued liabilities	(2,998,000)	3,355,000
Customer advance payments of orders	(209,000)	209,000
Lease liabilities	(886,000)	367,000
Net cash provided by (used in) operating activities	(480,000)	18,274,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(2,524,000)	(1,135,000)
Proceeds from sales of marketable securities	0	273,000
Net cash used in investing activities	(2,524,000)	(862,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	427,000	1,998,000
Repurchase of common stock	(4,408,000)	(2,666,000)
Net cash used in financing activities	(3,981,000)	(668,000)
Increase (decrease) in cash and cash equivalents	(6,985,000)	16,744,000
Cash and cash equivalents, beginning of the year	23,292,000	6,548,000
Cash and cash equivalents, end of the year	16,307,000	23,292,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 1,824,000	$ 4,136,000