Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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Note 11 - Fair Value Measurements - Fair Value on a Recurring Basis (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Common stock warrant liability	$ 16,316,054
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Cash and cash equivalents	1,216,000	$ 1,552,852
Certificate of deposit	10,020,164
Common stock warrant liability
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Certificate of deposit
Common stock warrant liability
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Certificate of deposit
Common stock warrant liability	$ 16,316,054