Note 6 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2021
Loans Held-for-sale [Member] | Changes Measurement [Member] | Fair Value, Nonrecurring [Member]
Assets, Fair Value Adjustment	$ 0	$ 0
Interest Rate Contract [Member]
Derivative, Fair Value, Net, Total	$ 0
Forward Contract [Member]
Derivative, Fair Value, Net, Total			$ 0