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Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments (USD $)
Mar. 31, 2015
Dec. 31, 2014
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]    
Cash and Cash Equivalents $ 72,551,754us-gaap_CashAndCashEquivalentsFairValueDisclosure $ 66,821,194us-gaap_CashAndCashEquivalentsFairValueDisclosure
Marketable Securities 12,500,000us-gaap_MarketableSecuritiesCurrent 6,750,000us-gaap_MarketableSecuritiesCurrent
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]    
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]    
Cash and Cash Equivalents 69,551,754us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 64,321,194us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]    
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]    
Cash and Cash Equivalents 3,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 2,500,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Marketable Securities 6,750,000us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 12,500,000us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member]    
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]    
Cash and Cash Equivalents 72,551,754us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 66,821,194us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Money Market Funds [Member]    
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]    
Cash and Cash Equivalents 69,551,754us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 64,321,194us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
Certificates of Deposit [Member]    
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]    
Cash and Cash Equivalents 3,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 2,500,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember
Marketable Securities $ 6,750,000us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember		 $ 12,500,000us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CertificatesOfDepositMember