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Investments (Details 2) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from the sales of available-for-sale securities | $ 0 | $ 0 |
Trading securities portfolio | 1,199,000 |  | $ 1,044,000
Gains | 7,000 | $ 23,000 |
Securities in a loss position for more than 12 months | 0 |  | 0
U.S. government security funds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Net Unrealized Losses | $ (3,000) |  | $ (22,000)

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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