Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Cash Flows From Operating Activities:
Net income	$ 508,000		$ 550,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Share-based compensation	78,000		81,000
Depreciation and amortization	146,000		154,000
Unrealized gain on marketable securities	(32,000)
Equity in income of unconsolidated affiliate	(139,000)		(105,000)
Changes in assets and liabilities:
Accounts receivable, net	(1,866,000)		(866,000)
Accounts receivable, related party	(20,000)		65,000
Inventories	(386,000)		315,000
Prepaid expenses	(790,000)		391,000
Accounts payable and accrued liabilities	5,000		(423,000)
Net cash provided by (used in) operating activities	(2,496,000)		162,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(102,000)		(584,000)
Net cash used in investing activities	(102,000)		(584,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	77,000
Repurchase of common stock	(576,000)		(1,150,000)
Net cash used in financing activities	(499,000)		(1,150,000)
Decrease in cash	(3,097,000)		(1,572,000)
Cash, beginning of the period	8,763,000	[1]	9,456,000
Cash, end of the period	$ 5,666,000		$ 7,884,000

[1] The condensed consolidated balance sheet as of December 31, 2017 has been prepared using information from the audited consolidated balance sheet as of that date.