Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018
Cash Flows From Operating Activities:
Net income	$ 2,665,000		$ 3,007,000
Adjustments to reconcile net income to net cash used in operating activities:
Stock-based compensation	353,000		312,000
Depreciation and amortization	410,000		430,000
Gain (loss) on marketable securities	(223,000)		40,000
Equity in income of unconsolidated affiliate	(371,000)		(393,000)
Operating lease expense, net of accretion	532,000
Changes in assets and liabilities:
Accounts receivable, net	(479,000)		(1,166,000)
Accounts receivable, related party	(372,000)		(134,000)
Inventories	(1,377,000)		897,000
Prepaid expenses	855,000		(834,000)
Accounts payable and accrued liabilities	(402,000)		(1,086,000)
Lease liabilities	(492,000)
Net cash provided by operating activities	1,099,000		1,073,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(1,164,000)		(424,000)
Proceeds from sales of marketable securities	133,000		15,000
Net cash used in investing activities	(1,031,000)		(409,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	95,000		224,000
Repurchase of common stock	(2,064,000)		(2,828,000)
Net cash used in financing activities	(1,969,000)		(2,604,000)
Decrease in cash	(1,901,000)		(1,940,000)
Cash, beginning of the period	7,007,000	[1]	8,763,000
Cash, end of the period	$ 5,106,000		$ 6,823,000

[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.