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Stock-Based Compensation And Stock Repurchases (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 07, 2019 | Nov. 07, 2017 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2017 | Mar. 02, 2017
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  | $ 16,200,000 |  |  |  |  |  |
Shares granted |  |  |  |  |  | 219,408 |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  | $ 129,000 |  | $ 112,000 | $ 200,000 | $ 197,000 |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | 1,400,000 |  |  | $ 1,400,000 |  |  |  |
Recognition period of unrecognized compensation cost |  |  |  |  |  | 1 year 11 months 27 days |  |  |  |
Percentage of option currently exercisable |  |  |  |  |  | 96.00% |  |  |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest |  |  | 900,000 |  |  | $ 900,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  | 271,000 |  | $ 227,000 | 480,000 | $ 521,000 |  |  |
Unrecognized estimated compensation cost related to non-vested stock options granted |  |  | 1,800,000 |  |  | $ 1,800,000 |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  | 1 year 9 months 4 days |  |  |  |
Restricted Stock Units (RSUs) [Member] | Directors [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
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% |  |  |  |
2017 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase program, remaining amount authorized |  |  | $ 13,500,000 |  |  | $ 13,500,000 |  |  |  |
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 |  |  | 2,197,460 |  |  |  |
Class A Nonvoting Common Stock [Member] | $25 Million Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase value |  |  | $ 11,500,000 |  |  | $ 11,500,000 |  |  |  |
Share price |  |  |  |  |  | $ 15.16 |  |  |  |
Shares repurchased plan, shares |  |  |  |  |  | 756,016 |  |  |  |
Class A Nonvoting Common Stock [Member] | $25 Million Stock Repurchased At $13.33 [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Share price |  |  | $ 13.33 |  |  |  |  |  |  |
Shares repurchased plan, shares |  |  | 196,389 |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  | $ 13.33 |  |  |  |
Shares granted |  |  |  |  |  | 219,408 |  | 126,840 |  |
Shares repurchased plan, shares |  |  |  |  |  | 196,955 |  |  |  |
Class A [Member] | $25 Million Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase program, amount authorized |  |  |  |  |  |  |  |  |  | $ 25,000,000
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  | 0 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of stock options and RSU |  |  |  |  |  | 4 years |  |  |  |
2010 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Additional shares authorized |  | 947,460 |  |  |  |  |  |  |  |
2010 Stock Incentive Plan [Member] | Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan |  |  |  |  |  |  |  |  | 1,250,000 |
Common Stock shares remaining for future issuances |  |  | 778,304 |  |  | 778,304 |  |  |  |
Repurchase program, shares available |  |  |  |  |  |  |  |  | 302,540 |
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expense | $ 35,000 |  |  |  |  |  |  |  |  |

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