Note 8 - Income Taxes (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year	2012
Domestic Tax Authority [Member] | Latest Tax Year [Member]
Open Tax Year	2015
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year	2011
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Open Tax Year	2015
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,300,000	$ 2,300,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0	0
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 110,100	$ 110,100