v2.4.0.8

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Estimated Lives Used in Determining Depreciation and Amortization | The estimated lives used in determining depreciation and amortization are:
Buildings and improvements |  |  | 12 – 40 years |
Warehouse and office equipment |  |  | 5 – 7 years |
Automobiles |  |  | 3 – 5 years |
Summary of Fair Value Measurement of Financial Assets | The following tables summarize the fair value measurements (in thousands of dollars) of our financial assets:
|  | At December 31, 2013 |
|  | Total |  |  | Quoted market prices in active markets (level 1) |  |  | Significant other observable Inputs (level 2) |
Cash equivalents – Overnight Investments |  | $ | 1,623 |  |  | $ | — |  |  | $ | 1,623 |
|  | At December 31, 2012 |
|  | Total |  |  | Quoted market prices in active markets (level 1) |  |  | Significant other observable Inputs (level 2) |
Cash equivalents – Overnight Investments |  | $ | 1,283 |  |  | $ | — |  |  | $ | 1,283 |

X
- Definition Schedule Of Property And Equipment At Cost Depreciation And Amortization Estimated Useful Lives Table [Text Block] + References No definition available. + Details
Name: | crv_ScheduleOfPropertyAndEquipmentAtCostDepreciationAndAmortizationEstimatedUsefulLivesTableTextBlock
Namespace Prefix: | crv_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
Name: | us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration