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Fair Value Measurements - AFS Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost to Fair Value
Amortized Cost	$ 3,117,000	$ 15,513,000
Gross Unrealized Gains	0	1,000
Gross Unrealized Losses	(6,000)	(34,000)
Fair Value	3,111,000	15,480,000
Unrealized gain (loss) on securities
Sales of marketable securities	0	0
Municipal bonds
Amortized Cost to Fair Value
Amortized Cost	2,867,000	15,063,000
Gross Unrealized Gains	0	1,000
Gross Unrealized Losses	(6,000)	(34,000)
Fair Value	2,861,000	15,030,000
Certificates of deposit
Amortized Cost to Fair Value
Amortized Cost	250,000	450,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 250,000	$ 450,000

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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