Note 2 - Business Combinations (Details) - Recognized Identified Assets Acquired and Liabilities Assumed (USD $)					0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Oct. 02, 2013 As Recorded by CVBK [Member] CVBK [Member]	Oct. 02, 2013 Fair Value Adjustments [Member] CVBK [Member]	Oct. 02, 2013 As Recorded by the Corporation [Member] Common Stock [Member] CVBK [Member]	Oct. 02, 2013 As Recorded by the Corporation [Member] Preferred Stock and Warrants [Member] CVBK [Member]	Oct. 02, 2013 As Recorded by the Corporation [Member] CVBK [Member]	Oct. 02, 2013 Common Stock [Member] CVBK [Member]	Oct. 02, 2013 Preferred Stock and Warrants [Member] CVBK [Member]
Note 2 - Business Combinations (Details) - Recognized Identified Assets Acquired and Liabilities Assumed [Line Items]
Consideration Paid					$ 846,000	$ 3,350,000	$ 4,196,000	$ 846,000	$ 3,350,000
Cash and cash equivalents			59,775,000				59,775,000
Securities available for sale, at fair value			119,916,000	181,000			120,097,000
Loans, net of allowance and unearned income			164,814,000	(17,748,000)			147,066,000
Corporate premises and equipment, net			7,448,000	3,500,000			10,948,000
Other real estate owned, net			895,000	(500,000)			395,000
Core deposit intangibles			41,000	4,066,000			4,107,000
Other assets			16,623,000	6,030,000			22,653,000
Total identifiable assets acquired			369,512,000	(4,471,000)			365,041,000
Deposits			313,711,000	1,710,000			315,421,000
Borrowings			40,000,000	2,124,000			42,124,000
Trust preferred capital notes			5,155,000	(716,000)			4,439,000
Other liabilities			4,684,000	84,000			4,768,000
Total identifiable liabilities assumed			363,550,000	3,202,000			366,752,000
Net identifiable assets (liabilities) assumed			5,962,000	(7,673,000)			(1,711,000)
Goodwill resulting from acquisition	$ 16,630,000	$ 16,630,000					$ 5,907,000