Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	$ 380,364,000	$ 401,502,000
Gross unrealized holding gains	4,518,000	8,745,000
Gross unrealized holding losses	7,573,000	1,993,000
Amortized cost	383,419,000	394,750,000
US Government Agencies Debt Securities [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	70,474,000	104,130,000
Gross unrealized holding gains	251,000	750,000
Gross unrealized holding losses	1,455,000	19,000
Amortized cost	71,678,000	103,399,000
State and Municipal [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	86,715,000	86,789,000
Gross unrealized holding gains	1,472,000	3,141,000
Gross unrealized holding losses	1,331,000	91,000
Amortized cost	86,574,000	83,739,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	126,945,000	107,973,000
Gross unrealized holding gains	1,493,000	3,169,000
Gross unrealized holding losses	1,694,000	33,000
Amortized cost	127,146,000	104,837,000
Collateralized Mortgage Obligations [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	85,678,000	94,091,000
Gross unrealized holding gains	679,000	1,188,000
Gross unrealized holding losses	1,483,000	155,000
Amortized cost	86,482,000	93,058,000
Pooled Trust Preferred Securities [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	2,091,000	1,962,000
Gross unrealized holding gains	81,000	51,000
Gross unrealized holding losses	1,509,000	1,608,000
Amortized cost	3,519,000	3,519,000
Corporate Debt Securities [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	3,991,000	2,502,000
Gross unrealized holding gains	16,000	44,000
Gross unrealized holding losses	31,000	0
Amortized cost	4,006,000	2,458,000
Equity Securities [Member]
Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale [Line Items]
Fair value	4,470,000	4,055,000
Gross unrealized holding gains	526,000	402,000
Gross unrealized holding losses	70,000	87,000
Amortized cost	$ 4,014,000	$ 3,740,000