Note 6 - Loans - Loans Held for Investment, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Provision for loan losses	$ (438)	$ (5,124)
Impaired Loans [Member]
Balance at beginning of period	(836)	(389)
Charge off		1,198
Transfer to (from) loans held for investment
Derecognition due to deconsolidation	655
Balance at end of period		(836)
Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses		(1,645)
Non Impaired Loans [Member]
Balance at beginning of period	(9,751)	(6,535)
Charge off
Transfer to (from) loans held for investment		(1,746)
Derecognition due to deconsolidation	9,751
Balance at end of period		(9,751)
Non Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses
Loans Held for Investment [Member] | Impaired Loans [Member]
Balance at beginning of period	(218)	(2,279)
Charge off	218	2,483
Transfer to (from) loans held for investment
Reversal of provision due to restructure of loan	438
Derecognition due to deconsolidation
Balance at end of period		(218)
Loans Held for Investment [Member] | Impaired Loans [Member] | Specific Reserve [Member]
Provision for loan losses	(438)	(422)
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)	(468)
Charge off
Transfer to (from) loans held for investment		1,746
Reversal of provision due to restructure of loan
Derecognition due to deconsolidation	181
Balance at end of period		(181)
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		$ (1,459)