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Fair Value of Financial Instruments (Schedule of Fair Value of Financial Instruments by Level in Hierarchy and Narrative) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | $ 14,841,418 us-gaap_TradingSecurities | $ 14,019,761 us-gaap_TradingSecurities
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 6,173,010 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 7,724,809 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 8,668,408 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 6,294,952 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
U.S. Treasury Notes and Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 1,338,010 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_UsTreasuryNotesAndBondsSecuritiesMember | 2,829,809 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_UsTreasuryNotesAndBondsSecuritiesMember
U.S. Treasury Notes and Bonds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 1,338,010 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_UsTreasuryNotesAndBondsSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 2,829,809 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_UsTreasuryNotesAndBondsSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
U.S. Treasury Notes and Bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_UsTreasuryNotesAndBondsSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_UsTreasuryNotesAndBondsSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
U.S. Agency Issued Mortgage-backed Securities - Variable Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 4,003,375 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 3,049,754 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
U.S. Agency Issued Mortgage-backed Securities - Variable Rate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
U.S. Agency Issued Mortgage-backed Securities - Variable Rate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 4,003,375 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 3,049,754 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
U.S. Agency Notes and Bonds - Fixed Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 3,251,336 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember | 1,496,700 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember
U.S. Agency Notes and Bonds - Fixed Rate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
U.S. Agency Notes and Bonds - Fixed Rate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 3,251,336 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,496,700 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
SBA Loan Pools - Variable Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 1,413,697 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_LoanPoolsMember | 1,748,498 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_LoanPoolsMember
SBA Loan Pools - Variable Rate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_LoanPoolsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_LoanPoolsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
SBA Loan Pools - Variable Rate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 1,413,697 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_LoanPoolsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,748,498 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = cpix_LoanPoolsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Municipal Bonds - VRDN |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 4,835,000 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MunicipalBondsMember | 4,895,000 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MunicipalBondsMember
Municipal Bonds - VRDN | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | 4,835,000 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 4,895,000 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Municipal Bonds - VRDN | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of marketable securities | $ 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 0 us-gaap_TradingSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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