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Stock-Based Compensation And Stock Repurchases (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 07, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Mar. 10, 2020 | Mar. 02, 2017
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  | 1,676,163 |  |  |  |
Shares granted |  |  | 219,408 |  |  |
Stock Option [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Compensation expense |  | $ 120,000 | $ 70,000 |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  | $ 1,000,000 |  |  |  |
Recognition period of unrecognized compensation cost |  | 1 year 8 months 9 days |  |  |  |
Share price |  | $ 3.89 |  |  |  |
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 | 216,000 | $ 209,000 |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  | $ 2,700,000 |  |  |  |
Vesting period of stock options and RSU |  | 2 years 1 month 13 days |  |  |  |
Percentage of shares vested |  | 100.00% |  |  |  |
Number of options, Grants |  | 566,680 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Directors [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Number of options, Grants |  | 129,796 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Management [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Percentage of shares vested |  | 25.00% |  |  |  |
Number of options, Grants |  | 436,884 |  |  |  |
2017 Stock Repurchase Plan [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  | $ 25,000,000 |
Repurchase program, remaining amount authorized |  | $ 26,000,000 |  |  |  |
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 |  |  |  |
Class A Nonvoting Common Stock [Member] | $25 Million Stock Repurchase Program [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Repurchase value |  | $ 24,000,000 |  |  |  |
Share price |  | $ 13.39 |  |  |  |
Shares repurchased plan, shares |  | 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 |  |  |  |
Forfeiture of shares |  | 8,000 |  | 25,000 |  |
Class A [Member] | 2017 Stock Repurchase Plan [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  |  |  | $ 26,000,000 |
Class A [Member] | $25 Million Stock Repurchase Program [Member] |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  |  | $ 25,000,000
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 |  | 521,297 |  |  |  |

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