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Note 11 - Other Borrowings and Subordinated Debentures - Long-term Debt (Details) (Parentheticals)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2015
Fixed rate			3.85%
U.S. Bank National Association [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	1.50%
Federal Home Loan Bank Advances [Member] | Minimum [Member]
Fixed rate	1.20%	1.20%
Federal Home Loan Bank Advances [Member] | Maximum [Member]
Fixed rate	7.37%	7.37%
Note Payable Due 10/15/2020 [Member]
Fixed rate	3.85%	3.85%
Trust Preferred Securities Due 12/30/2033 Floating Rate of 2.8% Above Three Month LIBOR 1 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	2.80%	2.80%
Trust Preferred Securities Due 6/30/2035 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	1.75%	1.75%
Trust Preferred Securities Due 9/15/2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	1.37%	1.37%
Trust Preferred Securities Due 12/5/2033 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	2.88%	2.88%
Trust Preferred Securities Due 10/18/2034 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	2.00%	2.00%
Trust Preferred Securities, Due 6/6/2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	1.57%	1.57%
Trust Preferred Securities, Due 12/15/2035 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	1.45%
Trust Preferred Securities, Due 6/26/2033 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	3.10%
Trust Preferred Securities, Due 10/7/2033 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	2.85%
Second Trust Preferred Securities Due 9/15/2037 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Floating rate	2.00%

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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