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Operating leases (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating leases Future Minimum Payments      
Lease expensesincurred $ 961,000fil_LeaseExpensesincurred $ 942,000fil_LeaseExpensesincurred $ 924,000fil_LeaseExpensesincurred
Primary lease Minimum payments 2015 980fil_PrimaryLeaseMinimumPayments2015    
Primary lease Minimum payments 2016 1,000fil_PrimaryLeaseMinimumPayments2016    
Primary lease Minimum payments 2017 83fil_PrimaryLeaseMinimumPayments2017    
Primary lease Minimum payments total $ 2,063fil_PrimaryLeaseMinimumPaymentsTotal