Note 4 - Loans/Leases Receivable - Impaired Loans Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Recorded investment with no specific allowance recorded	$ 4,912	$ 7,938	$ 7,117
Unpaid principal balance with no specific allowance recorded	5,115	10,706	7,203
Average recorded investment with no specific allowance recorded	4,009	6,208	6,354
Interest income recognized with no specific allowance recorded	86	279	216
Interest income recognized for cash payments received with no specific allowance recorded	86	279	216
Recorded investment with specific allowance recorded	3,749	12,265	11,237
Unpaid principal balance with specific allowance recorded	3,749	12,621	11,240
Average recorded investment with specific allowance recorded	2,412	5,460	10,513
Interest income recognized with specific allowance recorded	2		219
Interest income recognized for cash payments received with specific allowance recorded	2	113	219
Recorded investment	8,661	20,203	18,354
Unpaid principal balance	8,864	23,327	18,443
Related allowance	660	3,659	3,043
Average recorded investment	6,421	11,668	16,867
Interest income recognized	88	392	435
Interest income recognized for cash payments received	88	392	435
Commercial Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,607	1,846	1,634
Unpaid principal balance with no specific allowance recorded	1,647	4,540	1,645
Average recorded investment with no specific allowance recorded	970	2,346	1,406
Interest income recognized with no specific allowance recorded	27	210	71
Interest income recognized for cash payments received with no specific allowance recorded	27	210	71
Recorded investment with specific allowance recorded	239	2,653	4,615
Unpaid principal balance with specific allowance recorded	239	2,653	4,618
Average recorded investment with specific allowance recorded	124	1,118	4,584
Interest income recognized with specific allowance recorded		43	203
Interest income recognized for cash payments received with specific allowance recorded		43	203
Recorded investment	1,846	4,499	6,249
Unpaid principal balance	1,886	7,193	6,263
Related allowance	170	973	716
Average recorded investment	1,094	3,464	5,990
Interest income recognized	27	253	274
Interest income recognized for cash payments received	27	253	274
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	34	106	289
Unpaid principal balance with no specific allowance recorded	50	106	289
Average recorded investment with no specific allowance recorded	24	107	79
Interest income recognized with no specific allowance recorded			12
Interest income recognized for cash payments received with no specific allowance recorded			12
Recorded investment with specific allowance recorded		304	152
Unpaid principal balance with specific allowance recorded		660	152
Average recorded investment with specific allowance recorded		177	221
Recorded investment	34	410	441
Unpaid principal balance	50	766	441
Related allowance		39	48
Average recorded investment	24	284	300
Interest income recognized			12
Interest income recognized for cash payments received			12
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	4,844
Unpaid principal balance with specific allowance recorded		149	4,844
Average recorded investment with specific allowance recorded		159	4,448
Recorded investment		656	4,844
Unpaid principal balance		656	4,844
Related allowance		33	1,379
Average recorded investment		260	4,448
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Recorded investment with no specific allowance recorded	684	1,804	1,172
Unpaid principal balance with no specific allowance recorded	686	1,804	1,172
Average recorded investment with no specific allowance recorded	738	540	1,177
Interest income recognized with no specific allowance recorded	29
Interest income recognized for cash payments received with no specific allowance recorded	29
Recorded investment with specific allowance recorded	2,867	7,577	72
Unpaid principal balance with specific allowance recorded	2,867	7,577	72
Average recorded investment with specific allowance recorded	1,958	3,055	45
Interest income recognized with specific allowance recorded		58
Interest income recognized for cash payments received with specific allowance recorded		58
Recorded investment	3,551	9,381	1,244
Unpaid principal balance	3,553	9,381	1,244
Related allowance	125	2,052	2
Average recorded investment	2,696	3,595	1,222
Interest income recognized	29	58
Interest income recognized for cash payments received	29	58
Finance Leases Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	1,642	1,929	2,945
Unpaid principal balance with no specific allowance recorded	1,642	1,929	2,945
Average recorded investment with no specific allowance recorded	1,322	2,193	2,880
Interest income recognized with no specific allowance recorded	30	60	132
Interest income recognized for cash payments received with no specific allowance recorded	30	60	132
Recorded investment with specific allowance recorded	383	320	725
Unpaid principal balance with specific allowance recorded	383	320	725
Average recorded investment with specific allowance recorded	196	273	625
Interest income recognized with specific allowance recorded	2
Interest income recognized for cash payments received with specific allowance recorded	2
Recorded investment	2,025	2,249	3,670
Unpaid principal balance	2,025	2,249	3,670
Related allowance	270	194	504
Average recorded investment	1,518	2,466	3,505
Interest income recognized	32	60	132
Interest income recognized for cash payments received	32	60	132
Residential Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	469	984	943
Unpaid principal balance with no specific allowance recorded	614	1,058	1,018
Average recorded investment with no specific allowance recorded	481	723	686
Interest income recognized with no specific allowance recorded		9	1
Interest income recognized for cash payments received with no specific allowance recorded		9	1
Recorded investment with specific allowance recorded	180	1,126	761
Unpaid principal balance with specific allowance recorded	180	1,126	761
Average recorded investment with specific allowance recorded	72	553	549
Interest income recognized with specific allowance recorded		12	15
Interest income recognized for cash payments received with specific allowance recorded		12	15
Recorded investment	649	2,110	1,704
Unpaid principal balance	794	2,184	1,779
Related allowance	15	257	355
Average recorded investment	553	1,276	1,235
Interest income recognized		21	16
Interest income recognized for cash payments received		21	16
Consumer Portfolio Segment [Member]
Recorded investment with no specific allowance recorded	476	762	134
Unpaid principal balance with no specific allowance recorded	476	762	134
Average recorded investment with no specific allowance recorded	474	198	126
Recorded investment with specific allowance recorded	80	136	68
Unpaid principal balance with specific allowance recorded	80	136	68
Average recorded investment with specific allowance recorded	62	125	41
Interest income recognized with specific allowance recorded			1
Interest income recognized for cash payments received with specific allowance recorded			1
Recorded investment	556	898	202
Unpaid principal balance	556	898	202
Related allowance	80	111	39
Average recorded investment	$ 536	$ 323	167
Interest income recognized			1
Interest income recognized for cash payments received			$ 1