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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Advertising expense |  |  |  |  | $ 606,000 | $ 384,000 | $ 521,000
Quarterly cash dividend | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0 | $ 0 | $ 0.120
Allowance for doubtful accounts |  |  |  |  | $ 697,000 | $ 503,000 |
Notes receivable balance |  |  |  |  | 0 | 0 |
Write-down to inventory |  |  |  |  | 1,200,000 | 467,000 | $ 858,000
Write-downs to deferred preservation costs |  |  |  |  | $ 922,000 | $ 897,000 | $ 483,000
Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Advertising expense amortization period |  |  |  |  | 6 months |  |
Estimated useful lives |  |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Advertising expense amortization period |  |  |  |  | 1 year |  |
Estimated useful lives |  |  |  |  | 10 years |  |
ESPP Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
ESPP, percentage of market price for eligible employees |  |  |  |  | 85.00% |  |
RSAs, PSAs, RSUs, PSUs And Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |
RSAs, PSAs, RSUs, PSUs And Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Period within grant date stock options granted typically expire |  |  |  |  | 7 years |  |
ASU 2016-09 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 141,000 |  |
Retained Earnings [Member] | ASU 2016-09 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | (238,000) |  |
Additional Paid In Capital [Member] | ASU 2016-09 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | 379,000 |  |
Deferred Tax Assets [Member] | ASU 2016-09 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 141,000 |  |

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