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Long-Term Debt and Short-Term Borrowings, Line of Credit Borrowings (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Bank
Line of Credit Facility [Abstract] |  |
Borrowing capacity |  | $ 41,500
Number of banks in which unsecured line of credit maintained | Bank |  | 4
Average borrowings outstanding | $ 7,467 | $ 5,070
Weighted average cost of borrowings | 1.59% | 3.47%
Weighted average interest rate at year end | 1.30% | 2.92%
Committed Line of Credit, due 2022 [Member] |  |
Line of Credit Facility [Abstract] |  |
Borrowing capacity | $ 50,000 |
Committed Line of Credit, due 2022 [Member] | LIBOR [Member] |  |
Line of Credit Facility [Abstract] |  |
Basis adjustment | 1.05% |
Unsecured Line of Credit, First Note [Member] |  |
Line of Credit Facility [Abstract] |  |
Borrowing capacity |  | $ 13,000
Maturity period |  | 2 years
Outstanding borrowings under line of credit |  | $ 3,672
Unsecured Line of Credit, First Note [Member] | LIBOR [Member] |  |
Line of Credit Facility [Abstract] |  |
Basis adjustment |  | 1.20%
Unsecured Line of Credit, Second Note [Member] |  |
Line of Credit Facility [Abstract] |  |
Borrowing capacity |  | $ 11,000
Unsecured Line of Credit, Second Note [Member] | LIBOR [Member] |  |
Line of Credit Facility [Abstract] |  |
Basis adjustment |  | 1.25%
Unsecured Line of Credit, Third Note [Member] |  |
Line of Credit Facility [Abstract] |  |
Borrowing capacity |  | $ 7,500
Outstanding borrowings under line of credit |  | $ 4,000
Unsecured Line of Credit, Third Note [Member] | LIBOR [Member] |  |
Line of Credit Facility [Abstract] |  |
Basis adjustment |  | 1.15%
Unsecured Line of Credit, Fourth Note [Member] |  |
Line of Credit Facility [Abstract] |  |
Borrowing capacity |  | $ 10,000
Unsecured Line of Credit, Fourth Note [Member] | LIBOR [Member] |  |
Line of Credit Facility [Abstract] |  |
Basis adjustment |  | 1.20%

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Definition Element represents the number of banks in with unsecured line of credit maintained. + References No definition available. + Details
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- Details
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- Details
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- Details
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