Corporate Borrowings - Indebtedness Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized loan fees	$ (530)	$ (576)
Total	43,693	36,001
Less current maturities of long term debt	(4,362)	(4,359)
Long-term debt	39,331	31,642
Fixed asset sub-line term loan [Member] \| Fixed Asset Sub Line Facility [Member]
Debt Instrument [Line Items]
Credit Agreement (variable rate) due 2020	$ 5,002	5,253
Credit Agreement, interest rate (as a percent)	3.034%
Term Loan [Member] \| Credit Agreement, Variable Rate Due 2020 [Member]
Debt Instrument [Line Items]
Credit Agreement - Term Loan, 3.034% (variable rate) due 2020	$ 12,250	13,000
Variable interest rate (as a percent)	3.034%
Secured Debt [Member] \| Secured Promissory Note Due 2022 [Member]
Debt Instrument [Line Items]
Secured Promissory Note, 3.71% (variable rate) due 2022	$ 2,236	2,324
Variable interest rate (as a percent)	3.71%
Wells Fargo Bank [Member]
Debt Instrument [Line Items]
Credit Agreement, interest rate (as a percent)	2.768%
Wells Fargo Bank [Member] \| Fixed asset sub-line term loan [Member]
Debt Instrument [Line Items]
Credit Agreement (variable rate) due 2020	$ 24,735	$ 16,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The average effective interest rate during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate at the end of the reporting period.

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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