Note 3 - Acquisition of KSB - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		May 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill, Ending Balance			$ 12,513	$ 682	$ 682
King Bancorp Inc. [Member]
Securities available for sale		$ 12,427
Federal Home Loan Bank stock, at cost		1,517
Federal Reserve Bank stock, at cost		490
Loans		164,029
Allowance for loan losses		0
Net loans		164,029
Premises and equipment, net		3,461
Bank owned life insurance		3,431
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		1,519
Other real estate owned		0
Other assets and accrued interest receivable		831
Total assets acquired		192,782
Non-interest bearing		24,939
Interest bearing	[1],[2]	100,587
Total deposits		125,526
Federal funds purchased		1,566
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances		43,299	43,000
Other liabilities and accrued interest payable		313
Total liabilities assumed		176,613
Net assets acquired		16,169
Cash consideration paid		(28,000)
Goodwill, Ending Balance		11,831	$ 12,000
King Bancorp Inc. [Member] | Subordinated Debt [Member]
Long-term debt		3,609
King Bancorp Inc. [Member] | Line of Credit [Member]
Long-term debt		2,300
King Bancorp Inc. [Member] | As Recorded By Acquiree [Member]
Securities available for sale		12,404
Federal Home Loan Bank stock, at cost		1,517
Federal Reserve Bank stock, at cost		490
Loans		165,744
Allowance for loan losses		(1,812)
Net loans		163,932
Premises and equipment, net		4,358
Bank owned life insurance		3,431
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
Other real estate owned		325
Other assets and accrued interest receivable		867
Total assets acquired		192,401
Non-interest bearing		24,939
Interest bearing	[1],[2]	100,839
Total deposits		125,778
Federal funds purchased		1,566
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances		43,718
Other liabilities and accrued interest payable		313
Total liabilities assumed		177,284
Net assets acquired		15,117
King Bancorp Inc. [Member] | As Recorded By Acquiree [Member] | Subordinated Debt [Member]
Long-term debt		3,609
King Bancorp Inc. [Member] | As Recorded By Acquiree [Member] | Line of Credit [Member]
Long-term debt		2,300
King Bancorp Inc. [Member] | As Adjusted By Acuirer [Member]
Securities available for sale	[1],[3]	23
Federal Home Loan Bank stock, at cost	[1]	0
Federal Reserve Bank stock, at cost	[1]	0
Loans	[1],[4]	(1,597)
Allowance for loan losses	[1],[4]	1,812
Net loans	[1]	215
Premises and equipment, net	[1],[5]	(1,328)
Bank owned life insurance	[1]	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	[1],[6]	1,519
Other real estate owned	[1],[7]	(325)
Other assets and accrued interest receivable	[1],[8]	(36)
Total assets acquired	[1]	68
Non-interest bearing	[1]	0
Interest bearing	[1],[2]	(252)
Total deposits		(252)
Federal funds purchased	[1]	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances	[1],[9]	(419)
Other liabilities and accrued interest payable	[1]	0
Total liabilities assumed	[1]	(671)
Net assets acquired	[1]	739
King Bancorp Inc. [Member] | As Adjusted By Acuirer [Member] | Subordinated Debt [Member]
Long-term debt	[1]	0
King Bancorp Inc. [Member] | As Adjusted By Acuirer [Member] | Line of Credit [Member]
Long-term debt	[1]	0
King Bancorp Inc. [Member] | Recast Adjustment [Member]
Securities available for sale		0
Federal Home Loan Bank stock, at cost		0
Federal Reserve Bank stock, at cost		0
Loans	[4]	(118)
Allowance for loan losses		0
Net loans		(118)
Premises and equipment, net	[5]	431
Bank owned life insurance		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
Other real estate owned		0
Other assets and accrued interest receivable		0
Total assets acquired		313
Non-interest bearing		0
Interest bearing	[1],[2]	0
Total deposits		0
Federal funds purchased		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances		0
Other liabilities and accrued interest payable		0
Total liabilities assumed		0
Net assets acquired		313
King Bancorp Inc. [Member] | Recast Adjustment [Member] | Subordinated Debt [Member]
Long-term debt		0
King Bancorp Inc. [Member] | Recast Adjustment [Member] | Line of Credit [Member]
Long-term debt		0
King Bancorp Inc. [Member] | Cash [Member]
Cash and equivalents		3,316
King Bancorp Inc. [Member] | Cash [Member] | As Recorded By Acquiree [Member]
Cash and equivalents		3,316
King Bancorp Inc. [Member] | Cash [Member] | As Adjusted By Acuirer [Member]
Cash and equivalents	[1]	0
King Bancorp Inc. [Member] | Cash [Member] | Recast Adjustment [Member]
Cash and equivalents		0
King Bancorp Inc. [Member] | Interest-bearing Deposits [Member]
Cash and equivalents		1,761
King Bancorp Inc. [Member] | Interest-bearing Deposits [Member] | As Recorded By Acquiree [Member]
Cash and equivalents		1,761
King Bancorp Inc. [Member] | Interest-bearing Deposits [Member] | As Adjusted By Acuirer [Member]
Cash and equivalents	[1]	0
King Bancorp Inc. [Member] | Interest-bearing Deposits [Member] | Recast Adjustment [Member]
Cash and equivalents		$ 0

[1] Bancorp's acquisition of KSB closed on May 1, 2019. The fair value adjustments reported are preliminary estimates based on information obtained subsequent to May 1, 2019 and through December 31, 2019. Management is continuing to evaluate each of its estimates and may provide additional recast adjustments in future periods based on this continuing evaluation. To the extent that additional recast adjustments are posted in future periods, the resultant fair values and the amount of goodwill recorded by Bancorp will change.

[2] Reflects the fair value adjustment based on the Bancorp's evaluation of the assumed time deposits.

[3] Reflects the fair value adjustment based on Bancorp's evaluation of the acquired investment portfolio.

[4] Reflects the fair value adjustment based on Bancorp's evaluation of the acquired loan portfolio and to eliminate KSB's recorded allowance.

[5] Reflects the fair value adjustment based on Bancorp's evaluation of the premises and equipment acquired.

[6] Reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.

[7] Reflects the fair value adjustment based upon Bancorp's evaluation of the foreclosed real estate acquired.

[8] Reflects the write-off of a miscellaneous other asset.

[9] Reflects the fair value adjustment based upon Bancorp's evaluation of the assumed FHLB advances.