Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net (loss) income	$ (866,000)	$ 289,000
Depreciation and amortization	648,000	687,000
Amortization of purchased intangible assets	234,000	279,000
Stock-based compensation expense	57,000	67,000
Deferred income taxes	9,000	7,000
Revenue from non-monetary exchange		(257,000)
Changes in operating assets and liabilities:
Accounts receivable	(1,611,000)	(623,000)
Inventories	369,000	524,000
Prepaid expenses and other assets	(135,000)	(22,000)
Accounts payable and accrued expenses	(271,000)	83,000
Deferred revenue	365,000	374,000
Income taxes payable and prepaid income taxes	(49,000)	(28,000)
Net cash provided (used) by operating activities	(1,250,000)	1,380,000
Cash flows from investing activities:
Purchase of equipment, inventory and intangible assets		(1,000,000)
Purchases of property, equipment and improvements	(95,000)	(50,000)
Capitalized software development costs	(448,000)	(560,000)
Proceeds from sales of investments	3,251,000
Purchases of investments		(2,037,000)
Net cash used by investing activities	2,708,000	(3,647,000)
Net increase (decrease) in cash and cash equivalents	1,458,000	(2,267,000)
Cash and cash equivalents at beginning of period	7,546,000	9,641,000
Cash and cash equivalents at end of period	$ 9,004,000	$ 7,374,000