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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 | $ 961,000 fil_LeaseExpensesincurred | $ 942,000 fil_LeaseExpensesincurred | $ 924,000 fil_LeaseExpensesincurred
Primary lease Minimum payments 2015 | 980 fil_PrimaryLeaseMinimumPayments2015 |  |
Primary lease Minimum payments 2016 | 1,000 fil_PrimaryLeaseMinimumPayments2016 |  |
Primary lease Minimum payments 2017 | 83 fil_PrimaryLeaseMinimumPayments2017 |  |
Primary lease Minimum payments total | $ 2,063 fil_PrimaryLeaseMinimumPaymentsTotal |  |

X
- Definition The total amount of rentals incurred in the period on property subject to subleasing arrangements + References No definition available. + Details
Name: | fil_LeaseExpensesincurred
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | fil_OperatingLeasesFutureMinimumPaymentsAbstract
Namespace Prefix: | fil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of minimum lease payments for capital leases. + References No definition available. + Details
Name: | fil_PrimaryLeaseMinimumPayments2015
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of minimum lease payments for capital leases. + References No definition available. + Details
Name: | fil_PrimaryLeaseMinimumPayments2016
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of minimum lease payments for capital leases. + References No definition available. + Details
Name: | fil_PrimaryLeaseMinimumPayments2017
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of minimum lease payments for capital leases. + References No definition available. + Details
Name: | fil_PrimaryLeaseMinimumPaymentsTotal
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration