Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities:
Net income	$ 3,168,000	$ 1,041,000
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	190,000	24,000
Depreciation and amortization	544,000	703,000
Equity in income of unconsolidated affiliate	(498,000)	(32,000)
Deferred income taxes	21,000	(48,000)
Changes in assets and liabilities:
Accounts receivable, net	(1,886,000)	2,571,000
Accounts receivable, related party	(166,000)	325,000
Inventories	5,404,000	146,000
Prepaid expenses	(254,000)	1,380,000
Accounts payable and accrued liabilities	310,000	(139,000)
Net cash provided by operating activities	6,833,000	5,971,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(267,000)	(274,000)
Purchase of investments	(41,000)	(175,000)
Net cash used in investing activities	(308,000)	(449,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	17,000	765,000
Repurchase of common stock	(6,773,000)	(2,110,000)
Excess tax benefit from stock options exercised	6,000	9,000
Net cash used in financing activities	(6,750,000)	(1,336,000)
Increase (decrease) in cash	(225,000)	4,186,000
Cash, beginning of the year	9,681,000	5,495,000
Cash, end of the year	9,456,000	9,681,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 795,000	$ 303,000