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Discontinued Operations (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended
Dec. 12, 2014
May 02, 2015
Dec. 12, 2019
Dec. 11, 2018
Dec. 11, 2017
Dec. 11, 2017
Dec. 12, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net sales   $ 0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue          
Sale price             15,000,000cal_SalePrice
Proceeds from business disposition 4,400,000us-gaap_ProceedsFromDivestitureOfBusinesses            
Note receivable             7,500,000us-gaap_NotesAndLoansReceivableNetCurrent
Disposal Group, Including Discontinued Operations, Notes Receivable, First Periodic Payment Due             1,250,000cal_DisposalGroupIncludingDiscontinuedOperationsNotesReceivableFirstPeriodicPaymentDue
Disposal Group, Including Discontinued Operations, Notes Receivable, Periodic Payment Due After First installment             600,000cal_DisposalGroupIncludingDiscontinuedOperationsNotesReceivablePeriodicPaymentDueAfterFirstinstallment
Promissory note interest rate     9.00%cal_PromissoryNoteInterestRate 8.00%cal_PromissoryNoteInterestRate 7.00%cal_PromissoryNoteInterestRate 6.00%cal_PromissoryNoteInterestRate  
Debt Instrument, Convertible, Conversion Price             $ 21.50us-gaap_DebtInstrumentConvertibleConversionPrice1
Notes Receivable, Fair Value Disclosure   $ 7,000,000us-gaap_NotesReceivableFairValueDisclosure