Note 5 - Loans - Loans Held for Investment, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Provision for loan losses		$ (1,465)
Impaired Loans [Member]
Balance, at beginning of period	(836)	(391)
Charge off	181	135
Derecognition due to deconsolidation	655
Balance, at end of period		(1,209)
Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses		(953)
Impaired Loans [Member] | General Reserve [Member]
Provision for loan losses
Non Impaired Loans [Member]
Balance, at beginning of period	(9,751)	(6,533)
Charge off
Derecognition due to deconsolidation	9,751
Balance, at end of period		(6,492)
Non Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses
Non Impaired Loans [Member] | General Reserve [Member]
Provision for loan losses		41
Loans Held for Investment [Member] | Impaired Loans [Member]
Balance, at beginning of period	(218)	(2,279)
Charge off	218	2,279
Derecognition due to deconsolidation
Balance, at end of period		(205)
Loans Held for Investment [Member] | Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses		(205)
Loans Held for Investment [Member] | Impaired Loans [Member] | General Reserve [Member]
Provision for loan losses
Loans Held for Investment [Member] | Non Impaired Loans [Member]
Balance, at beginning of period	(181)	(494)
Charge off
Derecognition due to deconsolidation	181
Balance, at end of period		(858)
Loans Held for Investment [Member] | Non Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses
Loans Held for Investment [Member] | Non Impaired Loans [Member] | General Reserve [Member]
Provision for loan losses		$ (364)