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Note 11 - Other Borrowings (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2006	Dec. 31, 2017	Dec. 31, 2016
Annual Paydown of Principal Required		20.00%
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds		$ 192,200,000
Stock Issued During Period, Value, New Issues	$ 248,000	15,164,000	$ 11,210,000
Notes Payable	$ 8,300,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.67%
Mandatorily Redeemable Securities [Member] | Special Purpose Entity [Member]
Securities Sold under Agreements to Repurchase		$ 8,000,000

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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