Secured Lines of Credit Narrative (Details) - Secured Line of Credit [Member]	12 Months Ended
Dec. 31, 2016 USD ($)
London Interbank Offered Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument variable rate	2.50%
Bankers Trust [Member] \| 3.13% Interest Bearing Line of Credit [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 20,000,000

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant