Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATIONS:
Net income (loss)	$ 698,000	$ (464,000)
Adjustments to reconcile net income (loss) to net provided by cash (used for) operating activities:
Depreciation and amortization	343,000	373,000
Stock-based compensation expense	61,000	59,000
Non-cash interest income, net	(1,000)	(8,000)
Equity in (income) loss of affiliate company	(5,000)	16,000
Changes in operating assets and liabilities
Accounts receivable	(135,000)	(318,000)
Inventories	(30,000)	(222,000)
Other current assets	(192,000)	(98,000)
Accounts payable	131,000	(76,000)
Deferred revenue, current portion	(257,000)	43,000
Accrued payroll	(103,000)	(23,000)
Accrued expenses	(61,000)	60,000
Other current liabilities	(43,000)	(102,000)
Other liabilities	236,000	(3,000)
Net cash provided by (used for) operating activities	642,000	(763,000)
INVESTING ACTIVITIES:
Purchase of marketable securities	(67,000)	(41,000)
Proceeds from note and interest receivable	250,000	250,000
Purchases of property and equipment	(339,000)	(277,000)
Long-term investment	0	(300,000)
Net cash used for investing activities	(156,000)	(368,000)
Effects of exchange rate changes on cash	6,000	7,000
Net increase (decrease) in cash	492,000	(1,124,000)
Cash at beginning of period	2,347,000	3,152,000
Cash at end of period	2,839,000	2,028,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for income taxes	54,000	15,000
NON-CASH TRANSACTION:
Transfer of property and equipment to inventory	$ 147,000	$ 0