Note 2 - Business Combinations (Details) - Assets Acquired and Liabilities Assumed (USD $)				0 Months Ended						0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Oct. 02, 2013 Common Stock [Member] As Recorded by the Corporation [Member] CVBK [Member]	Oct. 01, 2013 Common Stock [Member] CVBK [Member]	Oct. 02, 2013 Preferred Stock and Warrants [Member] As Recorded by the Corporation [Member] CVBK [Member]	Oct. 01, 2013 Preferred Stock and Warrants [Member] CVBK [Member]	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] CVBK [Member]
Note 2 - Business Combinations (Details) - Assets Acquired and Liabilities Assumed [Line Items]
Consideration Paid				$ 846,000	$ 846,000	$ 3,350,000	$ 3,350,000			$ 4,196,000
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	$ 10,723,000							$ 5,907,000