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Investment in Available-for-Sale Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Cost	$ 2,540,490	$ 2,661,356
Available-for-sale Securities, Gross Unrealized Gains	14,824	25,461
Available-for-sale Securities, Gross Unrealized Losses	(28,772)	(28,627)
Available-for-sale Securities, Fair Value	2,526,542	2,658,190
U.S. federal agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Cost	90,549	19,592
Available-for-sale Securities, Gross Unrealized Gains	93	196
Available-for-sale Securities, Gross Unrealized Losses	(277)	0
Available-for-sale Securities, Fair Value	90,365	19,788
Municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Cost	735,826	1,154,841
Available-for-sale Securities, Gross Unrealized Gains	2,175	2,882
Available-for-sale Securities, Gross Unrealized Losses	(6)	(2,090)
Available-for-sale Securities, Fair Value	737,995	1,155,633
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Cost	1,539,377	1,193,494
Available-for-sale Securities, Gross Unrealized Gains	12,281	8,734
Available-for-sale Securities, Gross Unrealized Losses	(19,398)	(16,904)
Available-for-sale Securities, Fair Value	1,532,260	1,185,324
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Cost	174,738	285,524
Available-for-sale Securities, Gross Unrealized Gains	275	4,164
Available-for-sale Securities, Gross Unrealized Losses	(9,091)	(9,633)
Available-for-sale Securities, Fair Value	165,922	280,055
Equity securities - ClearSign common stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Cost		7,905
Available-for-sale Securities, Gross Unrealized Gains		9,485
Available-for-sale Securities, Gross Unrealized Losses		0
Available-for-sale Securities, Fair Value		$ 17,390

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

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Amount of unrealized gain before deducting unrealized loss on investments in 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

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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