Note 7 - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Short-term investments available for sale		$ 10,799,890
Earn-out milestone liability (Note 13)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Short-term investments available for sale
Earn-out milestone liability (Note 13)	$ 14,224,068	$ 13,921,412
Fair Value, Measurements, Recurring [Member]
Short-term investments available for sale		10,799,890
Earn-out milestone liability (Note 13)	14,224,068	13,921,412
Short-term investments available for sale		10,799,890
Earn-out milestone liability (Note 13)	$ 14,224,068	$ 13,921,412