Note 2 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Quoted Prices in Active Markets for Identical Items		Significant Other Observable Inputs		Significant Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
June 30, 2015
Assets
Money market	$	10,021,694	$	-	$	-	$	10,021,694
Total assets	$	10,021,694	$	-	$	-	$	10,021,694
Liabilities
Warrants to purchase common stock	$	-	$	-	$	457,850	$	457,850
Total Liabilities	$	-	$	-	$	457,850	$	457,850
December 31, 2014
Assets
Money market	$	10,014,243	$	-	$	-	$	10,014,243
Total assets	$	10,014,243	$	-	$	-	$	10,014,243
Liabilities
Warrants to purchase common stock	$	-	$	-	$	418,530	$	418,530
Total Liabilities	$	-	$	-	$	418,530	$	418,530

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Convertible Common Stock Warrant Liability
Balance as of December 31, 2014	$	418,530
Changes in estimated fair value		39,320
Balance as of June 30, 2015	$	457,850