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Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items] |  |
Cash & cash equivalents | $ 72,551,754 us-gaap_CashAndCashEquivalentsFairValueDisclosure |
Bank certificates of deposit | 6,750,000 us-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 & cash equivalents | 69,551,754 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 34,266,501 us-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 & cash equivalents | 3,000,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Bank certificates of deposit | 6,750,000 us-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 & cash equivalents | 72,551,754 us-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 & cash equivalents | 69,551,754 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember | 34,266,501 us-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 & cash equivalents | 3,000,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_CertificatesOfDepositMember |
Bank certificates of deposit | $ 6,750,000 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByAssetClassAxis = us-gaap_CertificatesOfDepositMember |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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