Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) - USD ($)		1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	May. 13, 2015	Apr. 30, 2015	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Repayments of Long-term Debt					$ 7,350,000
Gains (Losses) on Extinguishment of Debt				$ (6,894,185)	$ (6,894,185)
Extinguishment of Debt, Amount				103,500,000
Common Stock Offering 1 [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)	3,680,000				3,680,000
Share Price (in Dollars per share)	$ 18.25
Proceeds from Issuance of Common Stock	$ 63,500,000				$ 63,484,123
Term Note [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Repayments of Long-term Debt		$ 2,350,000	$ 2,350,000	$ 15,300,000
Debt Instrument, Interest Rate, Effective Percentage				3.27%	3.27%
Debt Instrument, Term						4 years
Series A Subordinated Notes [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Repayments of Long-term Debt				$ 2,700,000
Debt Instrument, Interest Rate, Stated Percentage				6.00%	6.00%
FHLB Advances and Wholesale Repurchase Agreements [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Repayments of Long-term Debt				$ 85,500,000
Long-term Debt, Weighted Average Interest Rate				4.36%	4.36%
Long-term Debt, Maturities, Repayments of Principal in Year Two						$ 30,500,000
Long-term Debt, Maturities, Repayments of Principal in Year Three						15,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four						10,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five						$ 30,000,000
Debt Instrument, Term						2 years 204 days
Brokered CD's and Overnight FHLB Advances [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Debt, Weighted Average Interest Rate				0.90%	0.90%
Wholesale Borrowings [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Long-term Debt, Weighted Average Interest Rate				1.96%	1.96%	2.66%
Debt Instrument, Increase (Decrease), Net					$ (60,400,000)
Long-term Debt, Maturities, Repayments of Principal in Year Two				$ 26,142,000	26,142,000	$ 50,642,000
Long-term Debt, Maturities, Repayments of Principal in Year Three				49,055,000	49,055,000	53,965,000
Long-term Debt, Maturities, Repayments of Principal in Year Four				60,283,000	60,283,000	60,042,000
Long-term Debt, Maturities, Repayments of Principal in Year Five				$ 59,341,000	59,341,000	$ 83,152,000
FHLB Advances [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Debt Instrument, Increase (Decrease), Net					$ 71,000,000
Wholesale Repurchase Agreements [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.40%	4.40%
Gains (Losses) on Extinguishment of Debt				$ (1,202,000)
Debt, Weighted Average Interest Rate				3.13%	3.13%	3.21%
Debt Instrument, Increase (Decrease), Net					$ 15,000,000
Brokered Time Deposits [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Debt Instrument, Increase (Decrease), Net					$ 25,600,000
Funded With the Proceeds from the Common Stock Issuance [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Extinguishment of Debt, Amount				$ 63,500,000
Funded Through the Maturity of Low-yielding Securities [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Extinguishment of Debt, Amount				27,700,000
Funded With Brokered CDs and Overnight FHLB Advances [Member]
Note 7 - Common Stock Offering and Balance Sheet Restructuring (Details) [Line Items]
Extinguishment of Debt, Amount				$ 12,300,000