Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from (used in) operating activities
Net income	$ 1,086	$ 548
Adjustments to reconcile net income to net cash from operating activities:
Depreciation	71	57
Realized gain on sale of investment securities	(794)	(73)
Interest accrued on investments	1	(3)
Loss on disposal of fixed assets	0	18
Change in allowance for doubtful accounts	1	0
Deferred income taxes	38	14
Stock option expense	6	0
Changes in:
Trade receivables	57	(118)
Inventories	(102)	(188)
Other current assets	41	(35)
Accounts payable	(16)	35
Accrued expenses	13	29
Deferred revenue	0	(12)
Accrued income taxes	330	37
Net cash from operating activities	732	309
Cash flows from (used in) investing activities:
Proceeds from sale of available-for-sale securities	874	2
Purchase of treasury bills	(5,249)	(4,300)
Proceeds from the maturity of treasury bills	0	9,500
Amount paid on the sale of the AutoData Systems Division	0	(14)
Purchase of property and equipment	(196)	(82)
Net cash from (used in) investing activities	(4,571)	5,106
Cash flows from (used in) financing activities:
Proceeds from issuance of stock	8	21
Dividends paid	(543)	(543)
Net cash used in financing activities	(535)	(522)
Net increase (decrease) in cash and cash equivalents	(4,374)	4,893
Cash and cash equivalents, beginning	5,476	583
Cash and cash equivalents, ending	1,102	5,476
Supplemental schedule of non-cash investing and financing activities
Net change in unrealized gain on investments, net of tax	313	218
Supplemental cash flow information
Cash paid during the year for income taxes	$ 207	$ 152