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Schedule IV - Mortgage Loans on Real Estate (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Mortgage Loans on Real Estate, Federal Income Tax Basis | $ 21,800 |
Mortgage Loans on Real Estate, Number of Loans | 11 |
Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 29,678 | [1]
Nonretail [Member] | Individually Less Than 3% [Member] |  |
Mortgage Loans on Real Estate, Number of Loans | 3 |
Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 2,475 | [1],[2]
Mortgage Loans on Real Estate, Interest Rate |  | [2],[3]
Nonretail [Member] | Individually Less Than 3% [Member] | Minimum [Member] |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 100 |
Mortgage Loans on Real Estate, Interest Rate | 6.88% |
Nonretail [Member] | Individually Less Than 3% [Member] | Maximum [Member] |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 400 |
Mortgage Loans on Real Estate, Interest Rate | 7.41% |
[1] | The instruments actual cash flows are denominated in U.S. dollars and Canadian dollars as indicated by the geographic location above
[2] | Comprised of three separate loans with original loan amounts ranging from $0.1 million to $0.4 million.
[3] | Interest rates range from 6.88% to 7.41%.

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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition Amount of the federal income tax basis of mortgage loans on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.8) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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