Note 9 - Purchase of Financial Assets (Details Textual) - USD ($) $ in Millions	9 Months Ended	53 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Loan Purchase Agreement Financial Asset for Which Transfer Is Accounted as a Purchase Total Commitment to Purchase	$ 50.0
Loan Purchase Agreement Financial Asset for Which Transfer is Accounted as a Purchase Par Value Purchased		$ 132.1
Loan Purchase Agreement Financial Asset for Which Transfer Is Accounted as a Purchase Net Discount Premium		87.3
Payments for Loans		$ 44.8