Note 4 - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015	Jun. 30, 2016 USD ($)	Jun. 30, 2015	Dec. 31, 2015 USD ($)
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Modifications, Number of Contracts
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Modifications, Number of Contracts			25		4
Troubled debt, balance	10,302		$ 10,302		$ 2,894
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Modifications, Number of Contracts
Troubled debt, balance
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications, Number of Contracts			3		2
Troubled debt, balance	184		$ 184		$ 137
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			28		6
Troubled debt, balance	10,486		$ 10,486		$ 3,031
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivable, Modifications, Number of Contracts			10
Troubled debt, balance	401		$ 401
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			10
Troubled debt, balance	401		$ 401
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			38		6
Troubled debt, balance	10,887		$ 10,887		$ 3,031
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Modifications, Number of Contracts			2		1
Troubled debt, balance	15		$ 15		$ 13
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			2		1
Troubled debt, balance	15		$ 15		$ 13
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Modifications, Number of Contracts			2		1
Troubled debt, balance	1,769		$ 1,769		$ 597
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Modifications, Number of Contracts			1		1
Troubled debt, balance	139		$ 139		$ 253
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications, Number of Contracts			18		11
Troubled debt, balance	1,870		$ 1,870		$ 1,335
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			21		13
Troubled debt, balance	3,778		$ 3,778		$ 2,185
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivable, Modifications, Number of Contracts			5		5
Troubled debt, balance	312		$ 312		$ 332
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			5		5
Troubled debt, balance	312		$ 312		$ 332
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			28		19
Troubled debt, balance	4,105		$ 4,105		$ 2,530
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Modifications, Number of Contracts			2		1
Troubled debt, balance	15		$ 15		$ 13
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			2		1
Troubled debt, balance	15		$ 15		$ 13
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Modifications, Number of Contracts			27		5
Troubled debt, balance	12,071		$ 12,071		$ 3,491
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Modifications, Number of Contracts			1		1
Troubled debt, balance	139		$ 139		$ 253
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications, Number of Contracts			21		13
Troubled debt, balance	2,054		$ 2,054		$ 1,472
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			49		19
Troubled debt, balance	14,264		$ 14,264		$ 5,216
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivable, Modifications, Number of Contracts			15		5
Troubled debt, balance	713		$ 713		$ 332
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts			15		5
Troubled debt, balance	713		$ 713		$ 332
Loans, Excluding Acquired Loans [Member]
Financing Receivable, Modifications, Number of Contracts			66		25
Troubled debt, balance	$ 14,992		$ 14,992		$ 5,561
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts	1		1
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications, Number of Contracts	7	4	9	6
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts	8	5	34	7
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts	9		11
Financing Receivable, Modifications, Number of Contracts	18		46	7