Note 10 - Deposits (Details Textual) - USD ($)		12 Months Ended
	May 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest-bearing Domestic Deposit, Brokered		$ 30,000,000	$ 30,000,000
Interest Expense, Time Deposits, 250,000 or More		1,300,000	431,000	$ 161,000
Related Party Deposit Liabilities		81,000,000	42,000,000
Deposit Liabilities Reclassified as Loans Receivable		$ 692,000	$ 886,000
King Bancorp Inc. [Member]
Finite-lived Intangible Assets Acquired	$ 126,000,000