Note 4 - Loans Leases Receivable - Impaired Loans Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Recorded investment with no specific allowance recorded	$ 3,924	$ 4,912
Unpaid principal balance with no specific allowance recorded	4,804	5,115
Average recorded investment with no specific allowance recorded	2,576	4,009
Interest income recognized with no specific allowance recorded	79	86
Interest income recognized for cash payments received with no specific allowance recorded	79	86
Recorded investment with specific allowance recorded	10,704	3,749
Unpaid principal balance with specific allowance recorded	10,704	3,749
Average recorded investment with specific allowance recorded	7,578	2,412
Interest income recognized with specific allowance recorded		2
Interest income recognized for cash payments received with specific allowance recorded		2
Recorded investment	14,628	8,661
Unpaid principal balance	15,508	8,864
Related allowance	2,680	660
Average recorded investment	10,154	6,421
Interest income recognized	79	88
Interest income recognized for cash payments received	79	88
Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded		34
Unpaid principal balance with no specific allowance recorded		50
Average recorded investment with no specific allowance recorded		24
Recorded investment		34
Unpaid principal balance		50
Average recorded investment		24
Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	1,133	684
Unpaid principal balance with no specific allowance recorded	1,933	686
Average recorded investment with no specific allowance recorded	494	738
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		2,867
Unpaid principal balance with specific allowance recorded		2,867
Average recorded investment with specific allowance recorded		1,958
Recorded investment		3,551
Unpaid principal balance		3,553
Related allowance		125
Average recorded investment		2,696
Interest income recognized		29
Interest income recognized for cash payments received		29
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,361	1,607
Unpaid principal balance with no specific allowance recorded	1,441	1,647
Average recorded investment with no specific allowance recorded	1,002	970
Interest income recognized with no specific allowance recorded	33	27
Interest income recognized for cash payments received with no specific allowance recorded	33	27
Recorded investment with specific allowance recorded	4,020	239
Unpaid principal balance with specific allowance recorded	4,020	239
Average recorded investment with specific allowance recorded	1,555	124
Recorded investment	5,381	1,846
Unpaid principal balance	5,461	1,886
Related allowance	650	170
Average recorded investment	2,557	1,094
Interest income recognized	33	27
Interest income recognized for cash payments received	33	27
Commercial Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment	7,487
Unpaid principal balance	8,287
Related allowance	1,938
Average recorded investment	6,220
Interest income recognized	29
Interest income recognized for cash payments received	29
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with specific allowance recorded	6,354
Unpaid principal balance with specific allowance recorded	6,354
Average recorded investment with specific allowance recorded	5,726
Related allowance	1,938
Direct financing leases
Recorded investment with no specific allowance recorded	578	1,642
Unpaid principal balance with no specific allowance recorded	578	1,642
Average recorded investment with no specific allowance recorded	483	1,322
Interest income recognized with no specific allowance recorded	17	30
Interest income recognized for cash payments received with no specific allowance recorded	17	30
Recorded investment with specific allowance recorded		383
Unpaid principal balance with specific allowance recorded		383
Average recorded investment with specific allowance recorded		196
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
Unpaid principal balance	578	2,025
Related allowance		270
Average recorded investment	483	1,518
Interest income recognized	17	32
Interest income recognized for cash payments received	17	32
Residential real estate
Recorded investment with no specific allowance recorded	719	469
Unpaid principal balance with no specific allowance recorded	719	614
Average recorded investment with no specific allowance recorded	476	481
Recorded investment with specific allowance recorded	258	180
Unpaid principal balance with specific allowance recorded	258	180
Average recorded investment with specific allowance recorded	227	72
Recorded investment	977	649
Unpaid principal balance	977	794
Related allowance	20	15
Average recorded investment	703	553
Installment and other consumer loans
Recorded investment with no specific allowance recorded	133	476
Unpaid principal balance with no specific allowance recorded	133	476
Average recorded investment with no specific allowance recorded	121	474
Recorded investment with specific allowance recorded	72	80
Unpaid principal balance with specific allowance recorded	72	80
Average recorded investment with specific allowance recorded	70	62
Recorded investment	205	556
Unpaid principal balance	205	556
Related allowance	72	80
Average recorded investment	$ 191	$ 536