v3.5.0.2

Note 7 - Accrued Liabilities (Details Textual) $ in Millions	3 Months Ended
	Jul. 31, 2016 USD ($)
Zheng Ge Electrical Company Ltd [Member]
Uninvoiced Materials and Services Received, Write-offs	$ 0.3

X

- Definition

Amount of direct write-downs of uninvoiced materials and services received liabilities.

+ References

No definition available.

+ Details

Name:	cmro_UninvoicedMaterialsAndServicesReceivedWriteoffs
Namespace Prefix:	cmro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_CounterpartyNameAxis=cmro_ZhengGeElectricalCompanyLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: