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Long-term Debt and Related Matters - Narrative (Details) | Jun. 26, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jan. 29, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 25, 2020 USD ($)
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Line of Credit Facility |  |  |  |  |
Line of credit facility, amount outstanding |  | $ 37,025,000 |  | $ 44,777,000 |
Second Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum aggregate indebtedness |  |  | $ 3,000,000 |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Line of credit, covenants, basket for dispositions |  |  |  |  | $ 25,000,000
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Revolving facility usage | 1.50 |  |  |  |
Line of credit, covenants, basket for dispositions | $ 40,000,000 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Inventories |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum working capital to revolving facility usage ratio | 0.50 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Accounts Receivable |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum working capital to revolving facility usage ratio | 0.85 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period One |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum leverage ratio | 3.25 |  |  |  |
Maximum liquidity ratio required | 3.50 |  |  |  |
Minimum interest coverage ratio | 1.00 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period Two |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum leverage ratio | 3.00 |  |  |  |
Maximum liquidity ratio required | 3.25 |  |  |  |
Minimum interest coverage ratio | 1.05 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period Three |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum leverage ratio | 2.75 |  |  |  |
Maximum liquidity ratio required | 3.00 |  |  |  |
Minimum interest coverage ratio | 1.15 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period Four |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Minimum interest coverage ratio | 1.25 |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Overnight Bank Funding Rate | First Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | First Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | First Amendment | Minimum |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.00% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | First Amendment | Maximum |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 3.00% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | First Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | First Amendment | Minimum |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | First Amendment | Maximum |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.00% |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving credit facility |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Line of credit facility, amount outstanding |  | 497,000 |  |  |
Potential increase to borrowing capacity | $ 50,000,000 |  |  |  |
Liquidity covenant | 25,000,000 |  |  |  |
Acquisition consideration threshold, per acquisition | 50,000,000 |  |  |  |
Aggregate acquisition threshold for four consecutive periods where acquisitions occurred | 50,000,000 |  |  |  |
Aggregate acquisition consideration threshold | 100,000,000 |  |  |  |
Line of credit facility, current borrowing capacity |  | $ 77,478,000 |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving credit facility | First Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 140,000,000 |  |  |  |
Line of credit facility, accordion feature, decrease limit | 120,000,000 |  |  |  |
Line of credit, accordion feature, lower borrowing capacity option | 25,000,000 |  |  | $ 5,000,000 |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Secured debt | First Amendment |  |  |  |  |
Line of Credit Facility |  |  |  |  |
Debt instrument, face amount | 25,000,000 |  |  |  |
Line of credit facility, amount outstanding | $ 22,500,000 |  |  |  |

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