Quarterly report pursuant to Section 13 or 15(d)

Investments - Amortized Cost and Estimated Fair Values of AFS Securities (Details)

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Investments - Amortized Cost and Estimated Fair Values of AFS Securities (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   $ 1,799,000
Gross Unrealized Gains   0
Gross Unrealized Losses   (23,000)
Fair Value   1,776,000
U.S. government security funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   1,799,000
Gross Unrealized Gains   0
Gross Unrealized Losses $ 0 (23,000)
Fair Value   $ 1,776,000