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Note 4 - Fair Values of Financial Instruments - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Investment securities, available for sale   $ 10,799,890
Earn-out milestone liability $ 13,188,226 13,921,412
Fair Value, Measurements, Recurring [Member]    
Investment securities, available for sale 1,680,000 10,799,890
Earn-out milestone liability 13,188,226 13,921,412
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities, available for sale 1,680,000 10,799,890
Earn-out milestone liability
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities, available for sale
Earn-out milestone liability $ 13,188,226 $ 13,921,412