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Note 5 - Loans and Allowance for Loan Losses - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unpaid Contractual Principal Balance	$ 57,334,000	$ 54,521,000
Recorded Investment With No Allowance	30,920,000	24,678,000
Recorded Investment With Allowance	13,003,000	19,018,000
Impaired Financing Receivable, Recorded Investment	43,923,000	43,696,000
Impaired Financing Receivable, Related Allowance	338,000	680,000
Average Investment in Impaired Loans	50,788,000	35,978,000	$ 16,700,000
Interest Income Recognized	1,780,000	1,593,000	$ 1,200,000
Consumer Portfolio Segment [Member]
Unpaid Contractual Principal Balance	4,925,000	2,209,000
Recorded Investment With No Allowance	4,775,000	2,170,000
Recorded Investment With Allowance		3,000
Impaired Financing Receivable, Recorded Investment	4,775,000	2,173,000
Impaired Financing Receivable, Related Allowance		1,000
Average Investment in Impaired Loans	3,357,000	1,412,000
Interest Income Recognized	153,000	67,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Unpaid Contractual Principal Balance	170,000	373,000
Recorded Investment With No Allowance	170,000	373,000
Recorded Investment With Allowance
Impaired Financing Receivable, Recorded Investment	170,000	373,000
Impaired Financing Receivable, Related Allowance
Average Investment in Impaired Loans	268,000	346,000
Interest Income Recognized	47,000	20,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Unpaid Contractual Principal Balance	4,755,000	1,836,000
Recorded Investment With No Allowance	4,605,000	1,797,000
Recorded Investment With Allowance		3,000
Impaired Financing Receivable, Recorded Investment	4,605,000	1,800,000
Impaired Financing Receivable, Related Allowance		1,000
Average Investment in Impaired Loans	3,089,000	1,066,000
Interest Income Recognized	106,000	47,000
Commercial Real Estate Portfolio Segment [Member]
Unpaid Contractual Principal Balance	39,177,000	38,238,000
Recorded Investment With No Allowance	20,804,000	18,559,000
Recorded Investment With Allowance	10,734,000	11,442,000
Impaired Financing Receivable, Recorded Investment	31,538,000	30,001,000
Impaired Financing Receivable, Related Allowance	338,000	417,000
Average Investment in Impaired Loans	34,239,000	28,854,000
Interest Income Recognized	1,175,000	1,274,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Unpaid Contractual Principal Balance	2,522,000	4,275,000
Recorded Investment With No Allowance	1,347,000	1,038,000
Recorded Investment With Allowance	895,000	2,374,000
Impaired Financing Receivable, Recorded Investment	2,242,000	3,412,000
Impaired Financing Receivable, Related Allowance	249,000	156,000
Average Investment in Impaired Loans	2,711,000	4,436,000
Interest Income Recognized	93,000	196,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Unpaid Contractual Principal Balance	14,347,000	12,970,000
Recorded Investment With No Allowance	12,725,000	10,630,000
Recorded Investment With Allowance	706,000	1,753,000
Impaired Financing Receivable, Recorded Investment	13,431,000	12,383,000
Impaired Financing Receivable, Related Allowance	53,000	162,000
Average Investment in Impaired Loans	12,904,000	9,486,000
Interest Income Recognized	443,000	419,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Unpaid Contractual Principal Balance	22,308,000	20,993,000
Recorded Investment With No Allowance	6,732,000	6,891,000
Recorded Investment With Allowance	9,133,000	7,315,000
Impaired Financing Receivable, Recorded Investment	15,865,000	14,206,000
Impaired Financing Receivable, Related Allowance	36,000	99,000
Average Investment in Impaired Loans	18,624,000	14,932,000
Interest Income Recognized	639,000	659,000
Commercial Portfolio Segment [Member]
Unpaid Contractual Principal Balance	13,232,000	14,074,000
Recorded Investment With No Allowance	5,341,000	3,949,000
Recorded Investment With Allowance	2,269,000	7,573,000
Impaired Financing Receivable, Recorded Investment	7,610,000	11,522,000
Impaired Financing Receivable, Related Allowance		262,000
Average Investment in Impaired Loans	13,192,000	5,712,000
Interest Income Recognized	452,000	252,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Unpaid Contractual Principal Balance	9,954,000	11,848,000
Recorded Investment With No Allowance	4,306,000	2,734,000
Recorded Investment With Allowance	2,269,000	7,573,000
Impaired Financing Receivable, Recorded Investment	6,575,000	10,307,000
Impaired Financing Receivable, Related Allowance		262,000
Average Investment in Impaired Loans	11,670,000	4,666,000
Interest Income Recognized	400,000	206,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Unpaid Contractual Principal Balance	3,278,000	2,226,000
Recorded Investment With No Allowance	1,035,000	1,215,000
Recorded Investment With Allowance
Impaired Financing Receivable, Recorded Investment	1,035,000	1,215,000
Impaired Financing Receivable, Related Allowance
Average Investment in Impaired Loans	1,522,000	1,046,000
Interest Income Recognized	$ 52,000	$ 46,000

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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+ References

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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 14A
-Subparagraph (b)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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