Note 11 - Fair Value of Financial Instruments (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Financial Assets at Fair Value Option	$ 14,000		$ 13,800
Financial Liabilities at Fair Value Option	42,900		41,800
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(2,080)	$ (100)
Financial Liabilites at Fair Value Option Contractual Principal	61,900		61,900
Financial Liabilities at Fair Value Option Accrued Interest Payable	$ 300		200
Appraised Value of Property [Member]
Collateral Dependent Loans Measurement Input	0.85
Fair Value, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0		$ 0
Interest Rate Swaps [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (1,100)	$ 1,700