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Equity Plans and Equity Based Compensation (Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2019 shares | Aug. 16, 2019 shares | Sep. 30, 2021 USD ($) plan shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) plan shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 shares | Dec. 31, 2019 installment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity incentive plans | plan |  |  | 2 |  | 2 |  |  |
Number of options granted (in shares) | shares |  |  | 0 | 0 | 0 | 0 |  |
Stock compensation expense |  |  | $ 180,000 | $ 249,000 | $ 547,000 | $ 737,000 |  |
Stock compensation expense, net of tax |  |  | 396,000 | 378,000 | 1,384,000 | 1,159,000 |  |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense |  |  | 0 | 0 | 0 | 0 |  |
Unrecognized compensation expense |  |  | 0 | 0 | 0 | 0 |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 2,753,000 | $ 1,071,000 | $ 2,753,000 | $ 1,071,000 |  |
Awards granted during period percentage |  |  |  |  |  |  | 66.67% | 60.00%
Awards granted cash credit entitlement percentage |  |  |  |  |  |  | 33.33% | 40.00%
Number of annual vesting installments | installment |  |  |  |  |  |  |  | 3
Restricted stock granted during period (in shares) | shares |  |  | 396 | 1,192 | 44,519 | 44,370 |  |
Unvested restricted stock awards (in shares) | shares |  |  | 99,956 |  | 99,956 |  | 64,401 |
Restricted Stock | Executive Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards granted during period percentage |  |  |  |  | 100.00% |  |  |
Restricted Stock | Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 100.00% |  |  |
Restricted Stock | Vesting Period One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 100.00% | 33.33%
Restricted Stock | Vesting Period One | Executive Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 33.33% |  |  |
Restricted Stock | Vesting Period Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 50.00% |
Restricted Stock | Vesting Period Two | Executive Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 33.33% |  |  |
Restricted Stock | Vesting Period Three | Executive Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  | 33.33% |  |  |
2009 Long-Term Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares reserved for new grants (in shares) | shares |  |  | 0 |  | 0 |  |  |
2009 Long-Term Equity Incentive Plan | Restricted Stock | Vesting Period Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  |  | 33.33%
2009 Long-Term Equity Incentive Plan | Restricted Stock | Vesting Period Three |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  |  | 50.00% | 33.33%
2019 LTI Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | shares |  |  | 1,000,000 |  | 1,000,000 |  |  |
2009 ESPP | Employee Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | shares |  | 750,000 |  |  |  |  |  |
Stock compensation expense |  |  | $ 14,000 | $ 11,000 | $ 24,000 | $ 30,000 |  |
Unrecognized compensation expense |  |  | 0 | 0 | 0 | 0 |  |
Purchase price percentage |  | 95.00% |  |  |  |  |  |
Stock compensation expense, net of tax |  |  | $ 11,000 | $ 8,000 | $ 18,000 | $ 23,000 |  |
2019 ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares reserved for new grants (in shares) | shares | 750,000 |  |  |  |  |  |  |
Purchase price percentage | 95.00% |  |  |  |  |  |  |
Offering periods | 3 months |  |  |  |  |  |  |

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