Note 21 - Acquisition - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Liabilities assumed:
Goodwill			$ 11,671	$ 665
Merchants Holding Company [Member]
Consideration paid:
Cash and fed funds sold			12,425
Investment securities			107,931
Loans, gross			87,570
Allowance for loan and lease losses			(1,286)
Interest receivable			688
Premises and equipment, net			378
Deferred tax assets, net			1,374
Federal Home Loan Bank of San Francisco stock			1,454
Life insurance			755
Other assets			371
Core deposit intangible
Total assets acquired			211,660
Liabilities assumed:
Demand, money market and savings			152,213
Certificates of deposit			38,003
Total deposits			190,216
Other liabilities			916
Total liabilities assumed			191,132
Net identifiable assets acquired over liabilities assumed			20,528
Merchants Holding Company [Member]
Consideration paid:
Cash	$ 15,300	$ 15,300	15,300
Stock 1,834,142 shares at $10.69 per share			19,607
Total consideration			34,907
Cash and fed funds sold			12,425
Investment securities			107,380
Investment securities, adjustment			(551)
Loans, gross			85,278
Loans, gross, adjustment			(2,292)
Allowance for loan and lease losses
Allowance for loan and lease losses, adjustment			1,286
Interest receivable			688
Premises and equipment, net			2,234
Premises and equipment, net, adjustment			1,856
Deferred tax assets, net			22
Deferred tax assets, net, adjustment			(1,352)
Federal Home Loan Bank of San Francisco stock			1,454
Life insurance			755
Other assets			466
Other assets, adjustment			95
Core deposit intangible			4,353
Core deposit intangible, adjustment			4,353
Total assets acquired	211,700	211,700	215,055
Total assets acquired, adjustment			3,395
Liabilities assumed:
Demand, money market and savings			152,213
Certificates of deposit			38,003
Total deposits			190,216
Other liabilities			938
Other liabilities, adjustment			22
Total liabilities assumed			191,154
Total liabilities assumed, adjustment			22
Net identifiable assets acquired over liabilities assumed			23,901
Net identifiable assets acquired over liabilities assumed, adjustment			3,373
Goodwill	$ 11,000	$ 11,000	$ 11,006