Note 4 - Loans, Allowance for Loan Losses and Other Real Estate Owned - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Balance at beginning of period	$ 20,477	$ 23,081	$ 21,351	$ 23,009
(Reversal) provision	0	0	0	0
Chargeoffs	(973)	(805)	(2,364)	(2,211)
Recoveries	613	764	1,130	2,242
Total allowance for loan losses	20,117	23,040	20,117	23,040
Unallocated Financing Receivable [Member]
Balance at beginning of period	3,449	3,918	3,177	3,666
(Reversal) provision	603	(159)	875	93
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Total allowance for loan losses	4,052	3,759	4,052	3,759
Commercial Portfolio Segment [Member]
Balance at beginning of period	6,506	8,517	6,311	7,746
(Reversal) provision	(1,346)	(662)	(1,221)	(679)
Chargeoffs	(48)	0	(71)	(41)
Recoveries	123	420	216	1,249
Total allowance for loan losses	5,235	8,275	5,235	8,275
Commercial Real Estate Portfolio Segment [Member]
Balance at beginning of period	3,927	3,824	3,884	3,849
(Reversal) provision	116	(35)	147	(60)
Chargeoffs	0	0	0	0
Recoveries	14	0	26	0
Total allowance for loan losses	4,057	3,789	4,057	3,789
Construction Portfolio Segment [Member]
Balance at beginning of period	853	175	1,465	335
(Reversal) provision	264	35	(348)	(125)
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Total allowance for loan losses	1,117	210	1,117	210
Residential Portfolio Segment [Member]
Balance at beginning of period	261	908	869	995
(Reversal) provision	(23)	156	(631)	69
Chargeoffs	0	0	0	0
Recoveries	0	0	0	0
Total allowance for loan losses	238	1,064	238	1,064
Consumer Portfolio Segment [Member]
Balance at beginning of period	5,481	5,739	5,645	6,418
(Reversal) provision	386	665	1,178	702
Chargeoffs	(925)	(805)	(2,293)	(2,170)
Recoveries	476	344	888	993
Total allowance for loan losses	$ 5,418	$ 5,943	$ 5,418	$ 5,943