Note 7 - Loans (Details) - Troubled Debt Restructurings Modified (USD $)	12 Months Ended		6 Months Ended								3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Commercial Loans Member Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Commercial Loans Member Accruing Troubled Debt Restructuring Member	Jun. 30, 2013 Commercial Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Commercial Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2013 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2013 Total [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Total [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2013 Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Accruing Troubled Debt Restructuring Member	Jun. 30, 2013 Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Accruing Troubled Debt Restructuring Member
Note 7 - Loans (Details) - Troubled Debt Restructurings Modified [Line Items]
No. of Loans			4	5	2	12	10	3	16	20
Pre-Modification Recorded Investment			$ 4,006,000	$ 1,988,000	$ 1,175,000	$ 44,619,000	$ 3,459,000	$ 1,802,000	$ 8,640,000	$ 48,409,000
Post-Modification Recorded Investment			4,006,000	1,988,000	1,175,000	40,940,000	3,381,000	1,802,000	8,562,000	44,730,000
Charge-offs	254,000			0	0	3,679,000	78,000	0	78,000	3,679,000	(78,000)	0	(78,000)	0
Specific Reserve	$ 12,779,000	$ 12,183,000	$ 55,000	$ 60,000	$ 9,000	$ 0	$ 155,000	$ 14,000	$ 219,000	$ 74,000