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Other Assets (Details) - Components of Other Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Note 8 - Other Assets (Details) - Components of Other Assets [Line Items] |  |  |
FHLB stock | $ 1,887 | $ 1,887 | $ 1,887
Accrued interest | $ 2,526 | 2,387 | 2,095
Deferred tax asset, net |  | 959 | 1,484
Other |  | 2,244 | 1,579
Total |  | 7,477 | 7,045
Investment Securities [Member] |  |  |
Note 8 - Other Assets (Details) - Components of Other Assets [Line Items] |  |  |
Accrued interest |  | 1,010 | 1,005
Loans 1 [Member] |  |  |
Note 8 - Other Assets (Details) - Components of Other Assets [Line Items] |  |  |
Accrued interest |  | $ 1,377 | $ 1,090

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + 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 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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