Note 2 - Securities (Detail) - The Amortized Cost And Approximate Fair Value Of Securities Is As Follows: (USD $)	6 Months Ended																																																																																											9 Months Ended	12 Months Ended							9 Months Ended	12 Months Ended												12 Months Ended						9 Months Ended
	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Amortized Cost [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Unrealized Gains [Member]	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Fair Value [Member]	Sep. 30, 2012 Held To Maturity [Member] Amortized Cost [Member]	Dec. 31, 2011 Held To Maturity [Member] Amortized Cost [Member]	Sep. 30, 2012 Held To Maturity [Member] Unrealized Gains [Member]	Dec. 31, 2011 Held To Maturity [Member] Unrealized Gains [Member]	Sep. 30, 2012 Held To Maturity [Member] Fair Value [Member]	Dec. 31, 2011 Held To Maturity [Member] Fair Value [Member]	Sep. 30, 2012 Federal Reserve Bank Stock [Member] Amortized Cost [Member]		Dec. 31, 2011 Federal Reserve Bank Stock [Member] Amortized Cost [Member]		Sep. 30, 2012 Federal Reserve Bank Stock [Member] Unrealized Gains [Member]		Dec. 31, 2011 Federal Reserve Bank Stock [Member] Unrealized Gains [Member]		Sep. 30, 2012 Federal Reserve Bank Stock [Member] Unrealized Losses [Member]		Dec. 31, 2011 Federal Reserve Bank Stock [Member] Unrealized Losses [Member]		Sep. 30, 2012 Federal Reserve Bank Stock [Member] OTTI [Member]		Dec. 31, 2011 Federal Reserve Bank Stock [Member] OTTI [Member]		Sep. 30, 2012 Federal Reserve Bank Stock [Member] Fair Value [Member]		Dec. 31, 2011 Federal Reserve Bank Stock [Member] Fair Value [Member]		Sep. 30, 2012 Subsidiary Trust [Member] Amortized Cost [Member]		Dec. 31, 2011 Subsidiary Trust [Member] Amortized Cost [Member]		Sep. 30, 2012 Subsidiary Trust [Member] Unrealized Gains [Member]		Dec. 31, 2011 Subsidiary Trust [Member] Unrealized Gains [Member]		Sep. 30, 2012 Subsidiary Trust [Member] Unrealized Losses [Member]		Dec. 31, 2011 Subsidiary Trust [Member] Unrealized Losses [Member]		Sep. 30, 2012 Subsidiary Trust [Member] OTTI [Member]		Dec. 31, 2011 Subsidiary Trust [Member] OTTI [Member]		Sep. 30, 2012 Subsidiary Trust [Member] Fair Value [Member]		Dec. 31, 2011 Subsidiary Trust [Member] Fair Value [Member]		Sep. 30, 2012 US Government Agencies Debt Securities [Member] Amortized Cost [Member]	Dec. 31, 2011 US Government Agencies Debt Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 US Government Agencies Debt Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 US Government Agencies Debt Securities [Member] Unrealized Gains [Member]	Sep. 30, 2012 US Government Agencies Debt Securities [Member] Unrealized Losses [Member]	Dec. 31, 2011 US Government Agencies Debt Securities [Member] Unrealized Losses [Member]	Sep. 30, 2012 US Government Agencies Debt Securities [Member] Fair Value [Member]	Dec. 31, 2011 US Government Agencies Debt Securities [Member] Fair Value [Member]	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Amortized Cost [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Unrealized Losses [Member]	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Fair Value [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Amortized Cost [Member]	Dec. 31, 2011 Corporate Debt Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 Corporate Debt Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 Corporate Debt Securities [Member] Unrealized Losses [Member]	Sep. 30, 2012 Corporate Debt Securities [Member] Fair Value [Member]	Dec. 31, 2011 Corporate Debt Securities [Member] Fair Value [Member]	Sep. 30, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Amortized Cost [Member]	Dec. 31, 2011 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Amortized Cost [Member]	Sep. 30, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Unrealized Gains [Member]	Dec. 31, 2011 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Unrealized Gains [Member]	Dec. 31, 2011 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Unrealized Losses [Member]	Sep. 30, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value [Member]	Dec. 31, 2011 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value [Member]	Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Amortized Cost [Member]	Dec. 31, 2011 Residential Mortgage Backed Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 Residential Mortgage Backed Securities [Member] Unrealized Gains [Member]	Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Unrealized Losses [Member]	Dec. 31, 2011 Residential Mortgage Backed Securities [Member] Unrealized Losses [Member]	Sep. 30, 2012 Residential Mortgage Backed Securities [Member] OTTI [Member]	Dec. 31, 2011 Residential Mortgage Backed Securities [Member] OTTI [Member]	Sep. 30, 2012 Residential Mortgage Backed Securities [Member] Fair Value [Member]	Dec. 31, 2011 Residential Mortgage Backed Securities [Member] Fair Value [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Amortized Cost [Member]	Dec. 31, 2011 Asset-backed Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Unrealized Gains [Member]	Dec. 31, 2011 Asset-backed Securities [Member] Unrealized Gains [Member]	Sep. 30, 2012 Asset-backed Securities [Member] OTTI [Member]	Dec. 31, 2011 Asset-backed Securities [Member] OTTI [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Fair Value [Member]	Dec. 31, 2011 Asset-backed Securities [Member] Fair Value [Member]	Sep. 30, 2012 CRA Funds [Member] Amortized Cost [Member]	Dec. 31, 2011 CRA Funds [Member] Amortized Cost [Member]	Sep. 30, 2012 CRA Funds [Member] Unrealized Gains [Member]	Dec. 31, 2011 CRA Funds [Member] Unrealized Gains [Member]	Sep. 30, 2012 CRA Funds [Member] Fair Value [Member]	Dec. 31, 2011 CRA Funds [Member] Fair Value [Member]	Dec. 31, 2011 Securities (Assets) [Member] Amortized Cost [Member]	Dec. 31, 2011 Securities (Assets) [Member] Unrealized Gains [Member]	Dec. 31, 2011 Securities (Assets) [Member] Unrealized Losses [Member]	Dec. 31, 2011 Securities (Assets) [Member] OTTI [Member]	Dec. 31, 2011 Securities (Assets) [Member] Fair Value [Member]	Sep. 30, 2012 Amortized Cost [Member]	Dec. 31, 2011 Amortized Cost [Member]	Sep. 30, 2012 Unrealized Gains [Member]	Sep. 30, 2012 Unrealized Losses [Member]	Sep. 30, 2012 OTTI [Member]	Sep. 30, 2012 Fair Value [Member]	Dec. 31, 2011 Fair Value [Member]
Debt Securities
Securities available-for-sale				$ 7,973,000																																																					$ 75,457,000	$ 91,660,000							$ 12,849,000	$ 5,467,000						$ 6,086,000	$ 6,102,000						$ 65,585,000	$ 52,594,000						$ 775,000	$ 900,000									$ 196,000	$ 231,000							$ 13,964,000	$ 13,700,000					$ 170,654,000					$ 174,912,000
Securities available-for-sale																																																											466,000	546,000							552,000	279,000						266,000	57,000						1,847,000	1,160,000						309,000	232,000									122,000	56,000							400,000	135,000				2,465,000						3,962,000
Securities available-for-sale																																																													(10,000)	(7,000)							(40,000)							(18,000)							(15,000)							(5,000)	(23,000)																					(103,000)						(15,000)
Securities available-for-sale	577,000																																																																																											(402,000)	(442,000)							(175,000)	(185,000)												(627,000)						(577,000)
Securities available-for-sale		163,918,000																																																													75,913,000	92,199,000						13,401,000	5,706,000						6,352,000	6,141,000						67,432,000	53,739,000									677,000	667,000							143,000	102,000					14,364,000	13,835,000					172,389,000						178,282,000
Securities held-to-maturity
Securities held-to-maturity					4,046,000	4,046,000					4,046,000	4,046,000
Securities held-to-maturity							726,000	490,000					726,000	490,000
Securities held-to-maturity		4,772,000	4,536,000						4,772,000	4,536,000					4,772,000	4,536,000
Other investments		5,774,000	6,484,000														4,691,000	[1]	5,401,000	[1]		[1]		[1]		[1]		[1]		[1]		[1]	4,691,000	[1]	5,401,000	[1]	1,083,000	[1]	1,083,000	[1]		[1]		[1]		[1]		[1]		[1]		[1]	1,083,000	[1]	1,083,000	[1]																																																											5,774,000	6,484,000				5,774,000	6,484,000
Other investments		$ 5,774,000	$ 6,484,000														$ 4,691,000	[1]	$ 5,401,000	[1]		[1]		[1]		[1]		[1]		[1]		[1]	$ 4,691,000	[1]	$ 5,401,000	[1]	$ 1,083,000	[1]	$ 1,083,000	[1]		[1]		[1]		[1]		[1]		[1]		[1]	$ 1,083,000	[1]	$ 1,083,000	[1]																																																											$ 5,774,000	$ 6,484,000				$ 5,774,000	$ 6,484,000

[1] Represents securities with restrictions and limited marketability and are carried at cost.