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Debt and Capital Leases (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 24, 2019 | Sep. 25, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense |  |  |  |  | $ 756,000 | $ 392,000
Cadence Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan Agreement, amount |  |  |  |  | 17,000,000 |
Loan Agreement, amount outstanding |  |  |  |  | $ 12,850,000 |
Interest rate |  |  |  |  | 0.25% |
Weighted average interest rate |  |  |  |  | 5.6733% |
Interest rate description |  |  |  |  | All borrowings under the Cadence Credit Facility, as amended, bear interest at a variable rate based upon the Company’s election of (i) 2.5% plus the base rate, which is the highest of the (a) Federal Funds Rate plus 0.5%, (b) the Cadence bank publicly-announced prime rate, and (c) LIBOR plus 1.0%, or (ii) LIBOR, with a 0.250% floor, plus 3.5%. Interest is due at the end of each calendar quarter if the Company selects to pay interest based on the base rate and at the end of each LIBOR period if it selects to pay interest based on LIBOR. |
Payment of debt issuance costs |  |  |  |  | $ 232,000 |
Maturity date |  |  |  |  | Dec. 31, 2021 |
Minimum liquidity amount |  |  |  |  | $ 2,000,000 |
Letters of credit outstanding, amount |  |  |  |  | $ 157,500 |
Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of certain loans outstanding | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 |  |

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