Note 6 - Investment Securities (Detail) - Temporarily Impaired Securities	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2012 Corporate Debt Securities [Member] USD ($)	Jun. 30, 2012 Corporate Debt Securities [Member] AFN	Dec. 31, 2011 Corporate Debt Securities [Member] USD ($)	Dec. 31, 2011 Corporate Debt Securities [Member] AFN	Jun. 30, 2012 Total [Member] USD ($)	Jun. 30, 2012 Total [Member] AFN	Dec. 31, 2011 Total [Member] USD ($)	Dec. 31, 2011 Total [Member] AFN	Jun. 30, 2012 US Treasury Securities [Member] USD ($)	Jun. 30, 2012 Collateralized Mortgage Backed Securities [Member] USD ($)	Dec. 31, 2011 Collateralized Mortgage Backed Securities [Member] USD ($)	Jun. 30, 2012 Mortgage Backed Securities Non Agency Member USD ($)	Dec. 31, 2011 Mortgage Backed Securities Non Agency Member USD ($)	Jun. 30, 2012 Collateralized Mortgage Obligations [Member] USD ($)	Dec. 31, 2011 Collateralized Mortgage Obligations [Member] USD ($)	Jun. 30, 2012 Asset-backed Securities [Member] USD ($)	Dec. 31, 2011 Asset-backed Securities [Member] USD ($)	Jun. 30, 2012 Trust Preferred Securities [Member] USD ($)	Dec. 31, 2011 Trust Preferred Securities [Member] USD ($)	Dec. 31, 2011 U.S. Government Sponsored Entities [Member] USD ($)	Dec. 31, 2011 Mutual Funds Member USD ($)
Securities Held-to-Maturity
Securities Held-to-maturity - Less than 12 Months - Fair Value			$ 9,688,000		$ 9,635,000		$ 9,688,000		$ 9,635,000
Securities Held-to-maturity - Less than 12 Months - Unrealized Losses			284,000		337,000		284,000		337,000
Securities Held-to-maturity - 12 Months or longer - Fair Value (in Afghanis)				0		0		0		0
Securities Held-to-maturity - 12 Months or longer - Unrealized Losses			0		0		0		0
Securities Held-to-maturity - Fair Value			9,688,000		9,635,000		9,688,000		9,635,000
Securities Held-to-maturity - Unrealized Losses			284,000		337,000		284,000		337,000
Securities Available-for-Sale
Securities Available-for-Sale - Less than 12 Months - Fair Value	245,511,000	253,430,000	72,765,000		185,577,000		235,823,000		243,795,000		159,835,000	69,000	564,000	0	0	0	0	0	0	3,154,000	5,674,000	49,993,000	1,987,000
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses	5,415,000	14,586,000	5,063,000		14,201,000		5,131,000		14,249,000		36,000	1,000	4,000	0	0	0	0	0	0	31,000	24,000	7,000	13,000
Securities Available-for-Sale - 12 Months or longer - Fair Value	250,760,000	180,347,000	249,819,000		172,857,000		250,760,000		180,347,000		0	194,000	35,000	97,000	6,719,000	498,000	570,000	152,000	166,000	0	0	0	0
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses	25,260,000	18,204,000	25,161,000		17,528,000		25,260,000		18,204,000		0	2,000	1,000	2,000	431,000	90,000	238,000	5,000	6,000	0	0	0	0
Securities Available-for-Sale - Fair Value	496,271,000	433,777,000	322,584,000		358,434,000		486,583,000		424,142,000		159,835,000	263,000	599,000	97,000	6,719,000	498,000	570,000	152,000	166,000	3,154,000	5,674,000	49,993,000	1,987,000
Securities Available-for-Sale- Unrealized Losses	30,675,000	32,790,000	30,224,000		31,729,000		30,391,000		32,453,000		36,000	3,000	5,000	2,000	431,000	90,000	238,000	5,000	6,000	31,000	24,000	7,000	13,000
Investment Securities - Less than 12 Months - Fair Value	245,511,000	253,430,000	72,765,000		185,577,000		235,823,000		243,795,000		159,835,000	69,000	564,000	0	0	0	0	0	0	3,154,000	5,674,000	49,993,000	1,987,000
Investment Securities - Less than 12 Months - Unrealized Losses	5,415,000	14,586,000	5,063,000		14,201,000		5,131,000		14,249,000		36,000	1,000	4,000	0	0	0	0	0	0	31,000	24,000	7,000	13,000
Investment Securities - Less than 12 Months - No of Issuances	250,760,000	180,347,000	249,819,000		172,857,000		250,760,000		180,347,000		0	194,000	35,000	97,000	6,719,000	498,000	570,000	152,000	166,000	0	0	0	0
Investment Securities - 12 Months or longer - Fair Value	25,260,000	18,204,000	25,161,000		17,528,000		25,260,000		18,204,000		0	2,000	1,000	2,000	431,000	90,000	238,000	5,000	6,000	0	0	0	0
Investment Securities- 12 Months or longer - Unrealized Losses	496,271,000	433,777,000	322,584,000		358,434,000		486,583,000		424,142,000		159,835,000	263,000	599,000	97,000	6,719,000	498,000	570,000	152,000	166,000	3,154,000	5,674,000	49,993,000	1,987,000
Investment Securities - 12 Months or longer - No. of Issuances	$ 30,675,000	$ 32,790,000	$ 30,224,000		$ 31,729,000		$ 30,391,000		$ 32,453,000		$ 36,000	$ 3,000	$ 5,000	$ 2,000	$ 431,000	$ 90,000	$ 238,000	$ 5,000	$ 6,000	$ 31,000	$ 24,000	$ 7,000	$ 13,000