v3.20.1

EARNINGS PER SHARE (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 28, 2020 | Mar. 30, 2019
EARNINGS PER SHARE |  |
Difference between the calculation of basic and diluted EPS (in dollars per share) | $ 0.00 | $ 0.00

X
- Definition Represents the difference between per share amount of basic and diluted earnings due to outstanding common stock equivalents, warrants or other convertible securities. + References No definition available. + Details
Name: | cuo_DifferenceBetweenEarningPerShareBasicAndDiluted
Namespace Prefix: | cuo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration