Note 6 - Fair Values of Assets and Liabilities - Summary of Fair Value Hierarchy for Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Loans, interest and fees receivable, at fair value		$ 4,386	$ 6,306
Fair Value, Recurring [Member]
Loans, interest and fees receivable, net for which it is practicable to estimate fair value	[1]	721,573	418,236
Loans, interest and fees receivable, at fair value	[1]	4,386	6,306
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Loans, interest and fees receivable, net for which it is practicable to estimate fair value	[1]
Loans, interest and fees receivable, at fair value	[1]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Loans, interest and fees receivable, net for which it is practicable to estimate fair value	[1]
Loans, interest and fees receivable, at fair value	[1]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Loans, interest and fees receivable, net for which it is practicable to estimate fair value	[1]	781,208	470,496
Loans, interest and fees receivable, at fair value	[1]	$ 4,386	$ 6,306

[1] For cash, deposits and investments in equity securities, the carrying amount is a reasonable estimate of fair value.