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Stock-Based Compensation And Stock Repurchases (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 10, 2020 | Aug. 07, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 02, 2017
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  |  | 1,692,195 |  |  | 1,692,195 |  |  |
Shares granted | 287,163 |  |  |  | 219,408 | 0 | 219,408 |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense |  |  | $ 120,000 |  | $ 129,000 | $ 239,000 | $ 200,000 |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | 900,000 |  |  | $ 900,000 |  |  |
Recognition period of unrecognized compensation cost |  |  |  |  |  | 1 year 6 months 25 days |  |  |
Share price |  |  |  |  |  | $ 4.25 |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense |  | $ 35,000 | 255,000 |  | $ 271,000 | 470,000 | $ 480,000 |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | 2,500,000 |  |  | $ 2,500,000 |  |  |
Vesting period of stock options and RSU |  |  |  |  |  | 2 years 7 days |  |  |
Percentage of shares vested |  |  |  |  |  | 100.00% |  |  |
Restricted Stock Units (RSUs) [Member] | Management [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  | 4 years |  |  |
Percentage of shares vested |  |  |  |  |  | 25.00% |  |  |
Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Shares granted |  |  |  |  |  | 0 |  |  |
2017 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized | $ 25,000,000.0 |  |  |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  | $ 26,000,000.0 |  |  | $ 26,000,000.0 |  |  |
Stock buy-back program period |  |  |  |  |  | 2 years |  |  |
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  |  | 2,197,460 |  |  | 2,197,460 |  |  |
Class A Nonvoting Common Stock [Member] | $25 Million Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Repurchase value |  |  | $ 24,000,000.0 |  |  | $ 24,000,000.0 |  |  |
Share price |  |  |  |  |  | $ 13.39 |  |  |
Shares repurchased plan, shares |  |  | 0 |  |  | 1,792,819 |  |  |
Class A Nonvoting Common Stock [Member] | $25 Million Stock Repurchased At $8.92 [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Share price |  |  |  | $ 8.92 |  |  |  |  |
Shares repurchased plan, shares |  |  |  | 75,157 |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  | $ 8.92 |  |  |
Shares granted |  |  |  |  |  |  |  | 219,408 |
Shares repurchased plan, shares |  |  |  |  |  | 75,157 |  |  |
Class A [Member] | 2017 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Repurchase program, remaining amount authorized | $ 26,000,000.0 |  |  |  |  |  |  |  |
Class A [Member] | $25 Million Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  |  |  |  |  | $ 25,000,000.0
2010 Stock Incentive Plan [Member] | Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Common Stock shares remaining for future issuances |  |  | 505,265 |  |  | 505,265 |  |  |

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