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Note 15 - Commitments - Operating Leases (Details) - Scenario, Forecast [Member] - USD ($) | 12 Months Ended
--- | ---
Feb. 28, 2020 | Feb. 28, 2019 | Feb. 28, 2018
Lease expiration date | Feb. 29, 2020 | Feb. 28, 2019 | Feb. 28, 2018
Lease start date | Mar. 01, 2019 | Mar. 01, 2018 | Mar. 01, 2017
Amount per month | $ 42,000 | $ 40,000 | $ 38,000

X
- Definition Date which lease or group of leases is set to start, in CCYY-MM-DD format. + References No definition available. + Details
Name: | ctib_LeaseInitiationDate
Namespace Prefix: | ctib_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the monthly rent required for operating lease. + References No definition available. + Details
Name: | ctib_OperatingLeaseMonthlyRent
Namespace Prefix: | ctib_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |