Stock Options (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Number of Options
Outstanding at beginning of year (in shares)	2,691	2,380
Granted at price = market value (in shares)	223	303
Granted at price > market value (in shares)	105	120
Exercised (in shares)	(230)	(60)
Forfeited (in shares)		(16)
Expired (in shares)	(10)	(36)
Outstanding at end of year (in shares)	2,779	2,691
Options exercisable at end of year (in shares)	2,012	1,791
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 0.77	$ 0.82
Granted at price = market value (in dollars per share)	$ 0.65	$ 0.69
Granted at price > market value (in dollars per share)	$ 0.72	$ 0.77
Exercised (in dollars per share)	$ 0.33	$ 0.33
Forfeited (in dollars per share)		$ 0.51
Expired (in dollars per share)	$ 5.21	$ 3.81
Outstanding at end of year (in dollars per share)	$ 0.78	$ 0.77
Options exercisable at end of year (in dollars per share)	$ 0.84	$ 0.89