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Note 9 - Notes Payable and Capital Leases - Leverage Ratios (Details)	3 Months Ended					12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Leverage ratio			3.5	4.25	4.5	4.75
Scenario, Forecast [Member]
Leverage ratio	2.75	3

X

- Definition

This element represents leverage ratio that is the how much capital comes in the form of debt (loans).

+ References

No definition available.

+ Details

Name:	ctib_LeverageRatio
Namespace Prefix:	ctib_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Details

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