Note 13 - Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Held to maturity investment securities	$ 2,868	$ 3,478
Reported Value Measurement [Member]
Assets
Cash and cash equivalents	93,246	120,408
Held to maturity investment securities	2,837	3,364
Loans, net	1,054,214	1,025,480
Accrued interest receivable	4,797	4,935
Federal Home Loan Bank and Federal Reserve Bank Stock	12,996	13,235
Liabilities
Deposits	1,334,787	1,379,903
Securities sold under agreements to repurchase	33,532	34,252
Federal Home Loan Bank advances	3,392	3,479
Subordinated notes payable to unconsolidated trusts	33,506	33,506
Accrued interest payable	396	261
Estimate of Fair Value Measurement [Member]
Assets
Cash and cash equivalents	93,246	120,408
Held to maturity investment securities	2,868	3,478
Loans, net	1,035,437	1,012,959
Accrued interest receivable	4,797	4,935
Federal Home Loan Bank and Federal Reserve Bank Stock	12,996	13,235
Liabilities
Deposits	1,334,390	1,380,122
Securities sold under agreements to repurchase	33,534	34,257
Federal Home Loan Bank advances	3,439	3,546
Subordinated notes payable to unconsolidated trusts	24,301	22,709
Accrued interest payable	396	261
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents	93,246	120,408
Held to maturity investment securities	0	0
Loans, net		0
Accrued interest receivable	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock	0	0
Liabilities
Deposits	1,135,600	1,157,045
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Subordinated notes payable to unconsolidated trusts	0	0
Accrued interest payable	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Held to maturity investment securities	2,868	3,478
Loans, net		0
Accrued interest receivable	4,797	4,935
Federal Home Loan Bank and Federal Reserve Bank Stock	0	0
Liabilities
Deposits	0	0
Securities sold under agreements to repurchase	33,534	34,257
Federal Home Loan Bank advances	3,439	3,546
Subordinated notes payable to unconsolidated trusts	0	0
Accrued interest payable	396	261
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Held to maturity investment securities	0	0
Loans, net	1,035,437	1,012,959
Accrued interest receivable	0	0
Federal Home Loan Bank and Federal Reserve Bank Stock	12,996	13,235
Liabilities
Deposits	198,790	223,077
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Subordinated notes payable to unconsolidated trusts	24,301	22,709
Accrued interest payable	$ 0	$ 0

Fair value portion of interest payable.

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Fair value portion of interest receivable.

+ References

No definition available.

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock and Federal Reserve Bank Stock.

+ References

No definition available.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- References

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- References

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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