Note 4 - Loans/Leases Receivable - Impaired Loans Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Recorded investment with no specific allowance recorded	$ 3,924	$ 4,912	$ 7,938
Unpaid principal balance with no specific allowance recorded	4,804	5,115	10,706
Average recorded investment with no specific allowance recorded	2,576	4,009	6,208
Interest income recognized with no specific allowance recorded	79	86	279
Interest income recognized for cash payments received with no specific allowance recorded	79	86	279
Recorded investment with specific allowance recorded	10,704	3,749	12,265
Unpaid principal balance with specific allowance recorded	10,704	3,749	12,621
Average recorded investment with specific allowance recorded	7,578	2,412	5,460
Interest income recognized with specific allowance recorded		2	113
Interest income recognized for cash payments received with specific allowance recorded		2	113
Recorded investment	14,628	8,661	20,203
Unpaid principal balance	15,508	8,864	23,327
Related allowance	2,680	660	3,659
Average recorded investment	10,154	6,421	11,668
Interest income recognized	79	88	392
Interest income recognized for cash payments received	79	88	392
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,361	1,607	1,846
Unpaid principal balance with no specific allowance recorded	1,441	1,647	4,540
Average recorded investment with no specific allowance recorded	1,002	970	2,346
Interest income recognized with no specific allowance recorded	33	27	210
Interest income recognized for cash payments received with no specific allowance recorded	33	27	210
Recorded investment with specific allowance recorded	4,020	239	2,653
Unpaid principal balance with specific allowance recorded	4,020	239	2,653
Average recorded investment with specific allowance recorded	1,555	124	1,118
Interest income recognized with specific allowance recorded			43
Interest income recognized for cash payments received with specific allowance recorded			43
Recorded investment	5,381	1,846	4,499
Unpaid principal balance	5,461	1,886	7,193
Related allowance	650	170	973
Average recorded investment	2,557	1,094	3,464
Interest income recognized	33	27	253
Interest income recognized for cash payments received	33	27	253
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded		34	106
Unpaid principal balance with no specific allowance recorded		50	106
Average recorded investment with no specific allowance recorded		24	107
Recorded investment with specific allowance recorded			304
Unpaid principal balance with specific allowance recorded			660
Average recorded investment with specific allowance recorded			177
Recorded investment		34	410
Unpaid principal balance		50	766
Related allowance			39
Average recorded investment		24	284
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Recorded investment with no specific allowance recorded			507
Unpaid principal balance with no specific allowance recorded			507
Average recorded investment with no specific allowance recorded			101
Recorded investment with specific allowance recorded			149
Unpaid principal balance with specific allowance recorded			149
Average recorded investment with specific allowance recorded			159
Recorded investment			656
Unpaid principal balance			656
Related allowance			33
Average recorded investment			260
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	1,133	684	1,804
Unpaid principal balance with no specific allowance recorded	1,933	686	1,804
Average recorded investment with no specific allowance recorded	494	738	540
Interest income recognized with no specific allowance recorded	29	29
Interest income recognized for cash payments received with no specific allowance recorded	29	29
Recorded investment with specific allowance recorded	6,354	2,867	7,577
Unpaid principal balance with specific allowance recorded	6,354	2,867	7,577
Average recorded investment with specific allowance recorded	5,726	1,958	3,055
Interest income recognized with specific allowance recorded			58
Interest income recognized for cash payments received with specific allowance recorded			58
Recorded investment	7,487	3,551	9,381
Unpaid principal balance	8,287	3,553	9,381
Related allowance	1,938	125	2,052
Average recorded investment	6,220	2,696	3,595
Interest income recognized	29	29	58
Interest income recognized for cash payments received	29	29	58
Direct financing leases
Recorded investment with no specific allowance recorded	578	1,642	1,929
Unpaid principal balance with no specific allowance recorded	578	1,642	1,929
Average recorded investment with no specific allowance recorded	483	1,322	2,193
Interest income recognized with no specific allowance recorded	17	30	60
Interest income recognized for cash payments received with no specific allowance recorded	17	30	60
Recorded investment with specific allowance recorded		383	320
Unpaid principal balance with specific allowance recorded		383	320
Average recorded investment with specific allowance recorded		196	273
Interest income recognized with specific allowance recorded		2
Interest income recognized for cash payments received with specific allowance recorded		2
Recorded investment	578	2,025	2,249
Unpaid principal balance	578	2,025	2,249
Related allowance		270	194
Average recorded investment	483	1,518	2,466
Interest income recognized	17	32	60
Interest income recognized for cash payments received	17	32	60
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	719	469	984
Unpaid principal balance with no specific allowance recorded	719	614	1,058
Average recorded investment with no specific allowance recorded	476	481	723
Interest income recognized with no specific allowance recorded			9
Interest income recognized for cash payments received with no specific allowance recorded			9
Recorded investment with specific allowance recorded	258	180	1,126
Unpaid principal balance with specific allowance recorded	258	180	1,126
Average recorded investment with specific allowance recorded	227	72	553
Interest income recognized with specific allowance recorded			12
Interest income recognized for cash payments received with specific allowance recorded			12
Recorded investment	977	649	2,110
Unpaid principal balance	977	794	2,184
Related allowance	20	15	257
Average recorded investment	703	553	1,276
Interest income recognized			21
Interest income recognized for cash payments received			21
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	133	476	762
Unpaid principal balance with no specific allowance recorded	133	476	762
Average recorded investment with no specific allowance recorded	121	474	198
Recorded investment with specific allowance recorded	72	80	136
Unpaid principal balance with specific allowance recorded	72	80	136
Average recorded investment with specific allowance recorded	70	62	125
Recorded investment	205	556	898
Unpaid principal balance	205	556	898
Related allowance	72	80	111
Average recorded investment	$ 191	$ 536	$ 323