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Debt and Leases - Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt:
Long-term Debt	$ 6,750,000	$ 9,750,000
Current portion of long-term debt	(3,000,000)	(3,000,000)
Long-term debt	3,750,000	6,750,000
Letter of Credit, Maximum	250,000
Letters of Credit Outstanding, Amount	$ 175,000
Loans payable | Capex loan
Debt:
Repayment term	7 years
Debt instrument, face amount	$ 12,000,000
Debt Instrument, Description of Variable Rate Basis	30 day LIBOR
Basis spread on variable rate	1.60%
Loans payable | Term Loan [Member]
Debt:
Long-term Debt	$ 6,750,000	$ 9,750,000
Debt Instrument, Interest Rate, Stated Percentage	3.36%	2.55%
Repayment term	5 years
Debt instrument, face amount	$ 15,500,000
Debt Instrument, Description of Variable Rate Basis	30 day LIBOR
Basis spread on variable rate	1.80%
Line of credit
Debt:
Percent of subsidiary stock not security for financing	65.00%
Debt Instrument, Description of Variable Rate Basis	daily LIBOR
Line of credit | Revolving line of credit
Debt:
Long-term Debt	$ 0	$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 18,000,000
Basis spread on variable rate	1.60%

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- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ 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 210.5-02.19,20)
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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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

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-SubTopic 30
-Section 55
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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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