Note 7 - Loans (Detail) - Schedule of Troubled Debt Restructuring by Type of Concession and Type of Loans (USD $)	Mar. 31, 2012	Dec. 31, 2011
Principal Deferral [Member] | Commercial Loans Member
Accruing TDRs	$ 12,911,000	$ 12,933,000
Principal Deferral [Member] | Real Estate Construction Loans [Member]
Accruing TDRs	16,820,000	16,820,000
Principal Deferral [Member] | Commercial Mortgage Loans [Member]
Accruing TDRs	14,275,000	471,000
Principal Deferral [Member] | Residential Mortgage Loans [Member]
Accruing TDRs	1,291,000	1,294,000
Principal Deferral [Member] | Total [Member]
Accruing TDRs	45,297,000	31,518,000
Rate Reduction [Member] | Commercial Loans Member
Accruing TDRs	1,738,000	1,756,000
Rate Reduction [Member] | Real Estate Construction Loans [Member]
Accruing TDRs	9,620,000	9,659,000
Rate Reduction [Member] | Commercial Mortgage Loans [Member]
Accruing TDRs	37,600,000	37,796,000
Rate Reduction [Member] | Residential Mortgage Loans [Member]
Accruing TDRs	1,032,000	587,000
Rate Reduction [Member] | Total [Member]
Accruing TDRs	49,990,000	49,798,000
Rate Reduction and Forgiveness of Principal [Member] | Commercial Mortgage Loans [Member]
Accruing TDRs	1,506,000	2,071,000
Rate Reduction and Forgiveness of Principal [Member] | Total [Member]
Accruing TDRs	1,506,000	2,071,000
Rate Reduction and Payment Deferral [Member] | Commercial Loans Member
Accruing TDRs	427,000	431,000
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Accruing TDRs	5,776,000	5,776,000
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Accruing TDRs	38,753,000	28,935,000
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
Accruing TDRs	1,484,000	1,487,000
Rate Reduction and Payment Deferral [Member] | Total [Member]
Accruing TDRs	46,440,000	36,629,000
Total Accruing TDR's [Member] | Commercial Loans Member
Accruing TDRs	15,076,000	15,120,000
Total Accruing TDR's [Member] | Real Estate Construction Loans [Member]
Accruing TDRs	32,216,000	32,255,000
Total Accruing TDR's [Member] | Commercial Mortgage Loans [Member]
Accruing TDRs	92,134,000	69,273,000
Total Accruing TDR's [Member] | Residential Mortgage Loans [Member]
Accruing TDRs	3,807,000	3,368,000
Total Accruing TDR's [Member] | Total [Member]
Accruing TDRs	$ 143,233,000	$ 120,016,000