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Debt - Revolving Loans (Narrative) (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Oct. 28, 2020 | Oct. 27, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Principal amount advanced |  |  | $ 688,000 | $ 1,125,000 |
Loan balance |  |  | 29,004,000 |  | $ 29,690,000
Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan balance |  |  | 15,791,000 |  | $ 16,390,000
Revolving Credit Facility | Incremental Revolving Commitment |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving loan commitment |  | $ 10,000,000 |  |  |
Debt term |  | 3 years |  |  |
Revolving Credit Facility | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving loan commitment |  | $ 25,000,000 |  |  |
Weighted average interest rate |  | 3.25% |  |  |
Available rate revolving loans |  |  | 24,278,000 |  |
Line of credit outstanding |  |  | 3,001,000 |  |
Letters of credit outstanding |  |  | $ 160,000 |  |
Revolving Credit Facility | Wells Fargo term loans payable | Letter of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving loan commitment |  | $ 2,000,000 |  |  |
Revolving Credit Facility | Wells Fargo term loans payable | Investment Grade | Accounts Receivable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Eligible investment grade |  | 90.00% |  |  |
Revolving Credit Facility | Wells Fargo term loans payable | Investment Grade | Inventories |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Eligible investment grade |  | 65.00% |  |  |
Revolving Credit Facility | Wells Fargo term loans payable | Non Investment Grade | Accounts Receivable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Eligible investment grade |  | 85.00% |  |  |
Revolving Credit Facility | Wells Fargo term loans payable | Keybank National Association |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount advanced | $ 8,745,000 |  |  |  |
Revolving Credit Facility | Keybank National Association |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan balance |  |  |  | $ 7,776,000 |
Variable interest rate |  |  |  | 6.62% |
Revolving Credit Facility | LIBOR | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 1.00% |  |  |
Revolving Credit Facility | LIBOR | Wells Fargo term loans payable | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 2.00% |  |  |
Stated interest rate |  | 0.75% |  |  |
Revolving Credit Facility | LIBOR | Wells Fargo term loans payable | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 2.50% |  |  |
Revolving Credit Facility | Base Rate | Wells Fargo term loans payable | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 1.00% |  |  |
Stated interest rate |  | 1.00% |  |  |
Revolving Credit Facility | Base Rate | Wells Fargo term loans payable | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 1.50% |  |  |
Revolving Credit Facility | Federal Funds Rate | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 0.50% |  |  |
Loans Payable | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 3.77% |  |
Loans Payable | Wells Fargo term loans payable | Keybank National Association |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount advanced | $ 16,790,000 |  |  |  |
Loans Payable | Keybank National Association |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan balance |  |  |  | $ 37,125,000 |
Variable interest rate |  |  |  | 7.50% |
Loans Payable | LIBOR | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 3.00% |  |  |
Stated interest rate |  | 0.75% |  |  |
Loans Payable | LIBOR | Wells Fargo term loans payable | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 1.00% |  |  |
Loans Payable | Base Rate | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 2.00% |  |  |
Stated interest rate |  | 1.00% |  |  |
Loans Payable | Federal Funds Rate | Wells Fargo term loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 0.50% |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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- Definition Period of time between issuance and maturity of debt instrument, 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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- Definition Indicates, if estimable, (as a percentage) the approximate extent to which the proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + 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
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