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Capital Notes (Narrative) (Details) - USD ($)		6 Months Ended		12 Months Ended
	Dec. 03, 2015	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015	Jan. 25, 2017
Debt Instrument [Line Items]
Proceeds used to pay off debt			$ 10,000,000
Capital note proceeds		$ 5,000,000
Common Stock Private Placement [Member]
Debt Instrument [Line Items]
Private placement transaction date		Dec. 03, 2015
Gross proceeds from private placement issuance	$ 11,520,000
Shares issued in private placement sale	1,000,000
Price per share in private placement sale	$ 11.52
2012 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Prepay Date		Jan. 05, 2016
Capital Notes 6% Due 4/1/2017 [Member]
Debt Instrument [Line Items]
Capital notes, interest rate			6.00%
Capital notes, maturity date			Apr. 01, 2017
Capital Notes 6% Due 4/1/2017 [Member] | 2012 Notes [Member]
Debt Instrument [Line Items]
Proceeds used to pay off debt				$ 10,000,000
Capital note issued				$ 10,000,000
Capital notes, interest rate				6.00%
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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