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Income Tax Expense (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Partnership | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) Partnership
Income Tax Expense [Abstract] |  |  |  |  |
Number of investments in partnerships | Partnership |  |  | 4 |  | 4
Investment amount in partnerships | $ 631,000 |  | $ 631,000 |  | $ 700,000
Investment Tax Credit Carryforward [Member] |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Investment tax credits | 775,000 |  | $ 775,000 |  |
Tax credits recognition period |  |  | 5 years 6 months |  |
Tax credits recognized as reduction of tax expense amount | 35,000 | $ 49,000 | $ 70,000 | $ 99,000 |
Amortization of investment in other expenses | $ 40,000 | $ 64,000 | $ 80,000 | $ 129,000 |

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- Definition Amount of long-term investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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