Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Balance	$ 7,674	$ 8,481	$ 8,481
Charge-offs	(60)	(47)	(755)
Recoveries	40	52	346
Provision for loan losses	134	50	(398)
Balance	7,788	8,536	7,674
Real Estate Construction Portfolio Segment[Member]
Balance	422	503	503
Provision for loan losses	171	8	(81)
Balance	593	511	422
Consumer Real Estate Portfolio Segment [Member]
Balance	1,930	2,165	2,165
Charge-offs	0	0	(13)
Recoveries	0	0	20
Provision for loan losses	5	201	(242)
Balance	1,935	2,366	1,930
Commercial Real Estate Portfolio Segment [Member]
Balance	3,121	3,853	3,853
Charge-offs	0	0	0
Recoveries	12	12	159
Provision for loan losses	290	(3)	(891)
Balance	3,423	3,862	3,121
Commercial Non Real Estate Segment [Member]
Balance	1,099	670	670
Charge-offs	0	0	(526)
Recoveries	3	2	33
Provision for loan losses	(158)	(38)	922
Balance	944	634	1,099
Public Sector and IDA Portfolio Segment[Member]
Balance	297	339	339
Provision for loan losses	10	(28)	(42)
Balance	307	311	297
Consumer Non Real Estate Portfolio Segment [Member]
Balance	444	555	555
Charge-offs	(60)	(47)	(216)
Recoveries	25	38	134
Provision for loan losses	6	(50)	(29)
Balance	415	496	444
Unallocated Financing Receivables [Member]
Balance	361	396	396
Provision for loan losses	(190)	(40)	(35)
Balance	$ 171	$ 356	$ 361