Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 5,476	$ 583
Treasury Bills	0	5,197
Available-for-sale securities	3,181	2,830
Trade receivables, less allowance for doubtful accounts of $9	731	577
Inventories	1,228	1,057
Income tax receivable	17	54
Other current assets	116	81
Total current assets	10,749	10,379
Property and equipment, net	1,179	1,174
Total assets	11,928	11,553
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	110	75
Accrued expenses	214	195
Deferred revenue	0	70
Total current liabilities	324	340
Deferred income tax liability	1,225	1,078
Commitments and contingencies
Stockholders' equity
Common stock par value $0.10 per share; authorized 10,000,000 shares; issued and outstanding: 3,389,577 and 3,381,999 shares, respectively	339	338
Additional paid-in capital	1,561	1,541
Retained earnings	6,570	6,565
Accumulated other comprehensive income (unrealized gain on available-for-sale securities, net of income tax)	1,909	1,691
Total stockholders' equity	10,379	10,135
Total liabilities and stockholders' equity	$ 11,928	$ 11,553