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Capital Notes (Narrative) (Details) - USD ($)	1 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jan. 25, 2017
Debt Instrument [Line Items]
Capital note proceeds			$ 5,000,000
Capital Notes 4% Due 1/24/2022 [Member]
Debt Instrument [Line Items]
Capital notes, interest rate		4.00%
Capital notes, maturity date		Jan. 24, 2022
Capital Notes 4% Due 1/24/2022 [Member] | 2017 Notes [Member]
Debt Instrument [Line Items]
Capital note issued				$ 5,000,000
Capital notes, interest rate				4.00%
Capital notes, maturity date		Jan. 24, 2022
Duration of written notice to holders		30 days
Capital Notes 4% Due 1/24/2022 [Member] | Equity Capital [Member]
Debt Instrument [Line Items]
Capital note proceeds	$ 3,000,000
Capital Notes 4% Due 1/24/2022 [Member] | Debt Services [Member]
Debt Instrument [Line Items]
Capital note proceeds		$ 2,000,000

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Contractual interest rate for funds borrowed, under the debt agreement.

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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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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