Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities:
Net income	$ 2,742,000	$ 2,079,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Share-based compensation expense	33,000	150,000
Depreciation and amortization	721,000	722,000
Equity in income of unconsolidated affiliate	(300,000)	(210,000)
Gain on investment in common stock warrants	(30,000)	(350,000)
Gain on sale of marketable securities	(379,000)
Deferred income taxes	267,000	(3,000)
Changes in assets and liabilities:
Accounts receivable, net	(518,000)	660,000
Accounts receivable, related party	(77,000)	619,000
Inventories	(2,404,000)	3,024,000
Prepaid expenses	(1,504,000)	(669,000)
Accounts payable and accrued liabilities	570,000	71,000
Net cash (used in) provided by operating activities	(879,000)	6,093,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(947,000)	(349,000)
Purchase of intangible assets		(1,000)
Purchase of investments	(134,000)
Proceeds from sale of investments	440,000	0
Net cash used in investing activities	(641,000)	(350,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	775,000	1,052,000
Repurchase of common stock	(2,206,000)	(3,134,000)
Excess tax benefit on stock options exercised	231,000
Net cash used in financing activities	(1,200,000)	(2,082,000)
Increase (decrease) in cash	(2,720,000)	3,661,000
Cash, beginning of the year	8,215,000	4,554,000
Cash, end of the year	5,495,000	8,215,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 968,000	$ 798,000