Note 7 - Investment Securities (Details) - Amortized Cost and Estimated Fair Values of Investment Securities Available-for-Sale (USD $)	9 Months Ended	12 Months Ended
	Sep. 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	$ 407,248,000	$ 401,502,000
Gross unrealized holding gains	4,885,000	8,745,000
Gross unrealized holding losses	7,881,000	1,993,000
Amortized cost	410,244,000	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	78,124,000	104,130,000
Gross unrealized holding gains	267,000	750,000
Gross unrealized holding losses	1,336,000	19,000
Amortized cost	79,193,000	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	88,873,000	86,789,000
Gross unrealized holding gains	1,301,000	3,141,000
Gross unrealized holding losses	1,351,000	91,000
Amortized cost	88,923,000	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	147,425,000	107,973,000
Gross unrealized holding gains	1,985,000	3,169,000
Gross unrealized holding losses	1,693,000	33,000
Amortized cost	147,133,000	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	79,766,000	94,091,000
Gross unrealized holding gains	634,000	1,188,000
Gross unrealized holding losses	1,958,000	155,000
Amortized cost	81,090,000	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	2,169,000	1,962,000
Gross unrealized holding gains	96,000	51,000
Gross unrealized holding losses	1,446,000	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	6,007,000	2,502,000
Gross unrealized holding gains	12,000	44,000
Gross unrealized holding losses	16,000	0
Amortized cost	6,011,000	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	4,884,000	4,055,000
Gross unrealized holding gains	590,000	402,000
Gross unrealized holding losses	81,000	87,000
Amortized cost	$ 4,375,000	$ 3,740,000