Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Cash Flows From Operating Activities:
Net income	$ 550,000		$ 507,000
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	81,000		16,000
Depreciation and amortization	154,000		154,000
Equity in income of unconsolidated affiliate	(105,000)		(98,000)
Changes in assets and liabilities:
Accounts receivable, net	(866,000)		(3,434,000)
Accounts receivable, unconsolidated affiliate	65,000		8,000
Inventories	315,000		1,643,000
Prepaid expenses and other current assets	391,000		570,000
Accounts payable and accrued liabilities	(423,000)		(25,000)
Net cash provided by(used in) operating activities	162,000		(659,000)
Cash Flows From Investing Activities:
Purchase of property and equipment	(584,000)		(55,000)
Purchase of marketable securities			(41,000)
Net cash used in investing activities	(584,000)		(96,000)
Cash Flows From Financing Activities:
Repurchase of common stock	(1,150,000)		(679,000)
Net cash used in financing activities	(1,150,000)		(679,000)
Decrease in cash	(1,572,000)		(1,434,000)
Cash, beginning of the period	9,456,000	[1]	9,681,000
Cash, end of the period	7,884,000		8,247,000
Accounting Standards Update 2016-09 [Member]
Noncash investing and financing information:
Cumulative-effect adjustment of change in accounting for stock-based compensation	$ 866,000

[1] The condensed consolidated balance sheet as of December 31, 2016 has been prepared using information from the audited consolidated balance sheet as of that date.