Stock based compensation (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Based Compensation Details Narrative
Value of restricted stocks granted to employees at grant date	$ 200	$ 200	$ 75
Restricted Stock Balance, ending	30,409	25,572	19,452	15,045
Compensation expense recorded from amortization of restricted stock expected to vest	$ 105	$ 78	$ 43
Tax effect of amortization of restricted stock	$ 41	$ 31	$ 17