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Income Taxes (Details 1) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Allowance for doubtful accounts $ 69,898ctib_DeferredTaxAssetsDoubtfulAccountsAllowance $ 54,352ctib_DeferredTaxAssetsDoubtfulAccountsAllowance
Inventory allowances 246,425us-gaap_DeferredTaxAssetsInventory 283,193us-gaap_DeferredTaxAssetsInventory
Accrued liabilities 282,055ctib_DeferredTaxAssetsAccruedLiabilities 200,395ctib_DeferredTaxAssetsAccruedLiabilities
Unicap 263A adjustment 157,240ctib_DeferredTaxAssetsAdjustments 186,611ctib_DeferredTaxAssetsAdjustments
Net operating loss carryforwards 685,322us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 690,846us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Alternative minimum tax credit carryforwards 398,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 398,162us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
State investment tax credit carryforward 10,912ctib_DeferredTaxAssetsStateInvestmentTaxCreditCarryforwards 76,668ctib_DeferredTaxAssetsStateInvestmentTaxCreditCarryforwards
Foreign tax credit carryforward 696,509us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 615,080us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Other foreign tax items 50,747us-gaap_DeferredTaxAssetsOther 0us-gaap_DeferredTaxAssetsOther
Foreign net operating loss carryforwards 466,053us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 461,965us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Total deferred tax assets 3,063,323us-gaap_DeferredTaxAssetsGross 2,967,272us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Tax over book basis of capital assets (1,083,852)ctib_DeferredTaxLiabilityTaxBasisCapitalAssets (1,354,409)ctib_DeferredTaxLiabilityTaxBasisCapitalAssets
Undistributed Earnings from Subsidiaries (247,385)us-gaap_UndistributedEarningsOfForeignSubsidiaries (211,274)us-gaap_UndistributedEarningsOfForeignSubsidiaries
Other foreign tax items 0us-gaap_DeferredTaxLiabilitiesOther (152,705)us-gaap_DeferredTaxLiabilitiesOther
Net deferred tax assets $ 1,732,086us-gaap_DeferredTaxAssetsNet $ 1,248,884us-gaap_DeferredTaxAssetsNet