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Note 20 - Business Acquisition (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

(In  Thousands, Except Per Share Data)
Purchase Price Consideration in Common Stock
Middlefield Banc Corp. shares issued			544,610
Value assigned to Middlefield Banc Corp. common shares		$	38.55
Purchase price assigned to Liberty common shares exchanged for Middlefield Banc Corp. shares							20,995
Purchase Price Consideration in Cash
Purchase price assigned to Liberty common shares exchanged for cash							21,173
Total Purchase Price							42,168
Previously held equity interest in Liberty							1,068
Net Assets Acquired:
Liberty shareholders equity		$	30,474
Adjustments to reflect assets acquired at fair value:
Loans
Allowance for loan loss			3,257
Loans - interest rate			578
Loans - general credit			(2,161	)
Core deposit intangible			3,087
Other			254
Adjustments to reflect liabilities acquired at fair value:
Time deposits			(141	)
Deferred taxes			(906	)
Change in control			(1,718	)
Total net assets acquired							32,724
Goodwill resulting from merger						$	10,512

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

(In  Thousands)
Total purchase price						$	42,168
Previously held equity interest in Liberty							1,068
Assets (liabilities) acquired:
Net assets acquired:
Cash			26,604
Loans and loans held for sale			201,341
Premises and equipment, net			325
Accrued interest receivable			440
Bank-owned life insurance			1,681
Core deposit intangible			3,087
Other assets			997
Time deposits			(30,744	)
Non-time deposits			(167,300	)
Accrued interest payable			(47	)
Deferred taxes			(906	)
Other liabilities			(2,754	)
Total net assets acquired							32,724
Goodwill resulting from the Liberty merger						$	10,512

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

2018		$	352
2019			341
2020			332
2021			321
2022			309
Thereafter			1,094
Total		$	2,749

Business Acquisition, Pro Forma Information [Table Text Block]

		Actual from Acquisition Date Through December 31, 2017
		(in thousands)
Net interest income		$	10,354
Noninterest income		$	744
Net income		$	2,625

		Pro Formas
		Twelve-month period ended December 31,
		2017				2016
		(in thousands, except per share data)
Net interest income		$	37,646			$	34,817
Noninterest income			4,920				5,485
Net income		$	8,438			$	8,692
Pro forma earnings per share:
Basic		$	2.79			$	4.12
Diluted		$	2.77			$	4.10

Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]

Notes Tables

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Remaining	2018		$	352
	2019			341
	2020			332
	2021			321
	2022			309
	Thereafter			1,094
			$	2,749

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