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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost, due within 5 years |  |
Amortized cost, due after 5 years through 10 years | 16,536 | 16,700
Amortized cost, due after 10 years | 8,818 | 9,130
Available-for-sale securities, amortized cost | 25,354 | 25,830
Fair value, due within 5 years |  |
Fair value, due after 5 years through 10 years | 16,284 | 16,583
Fair value, due after 10 years | 8,509 | 8,993
Fair value, total | 24,793 | 25,576
Corporate Debt Securities [Member] |  |
Amortized cost, due within 5 years |  |
Amortized cost, due after 5 years through 10 years | 9,000 | 9,000
Amortized cost, due after 10 years | 5,000 | 5,000
Available-for-sale securities, amortized cost | 14,000 | 14,000
Fair value, due within 5 years |  |
Fair value, due after 5 years through 10 years | 8,847 | 8,928
Fair value, due after 10 years | 4,754 | 4,876
Fair value, total | 13,601 | 13,804
Subordinated Notes [Member] |  |
Amortized cost, due within 5 years |  |
Amortized cost, due after 5 years through 10 years | 4,500 | 4,500
Amortized cost, due after 10 years |  |
Available-for-sale securities, amortized cost | 4,500 | 4,500
Fair value, due within 5 years |  |
Fair value, due after 5 years through 10 years | 4,537 | 4,548
Fair value, due after 10 years |  |
Fair value, total | 4,537 | 4,548
Available-for-sale Securities with Single Maturity Dates [Member] |  |
Amortized cost, due within 5 years |  |
Amortized cost, due after 5 years through 10 years | 13,500 | 13,500
Amortized cost, due after 10 years | 5,000 | 5,000
Available-for-sale securities, amortized cost | 18,500 | 18,500
Fair value, due within 5 years |  |
Fair value, due after 5 years through 10 years | 13,384 | 13,476
Fair value, due after 10 years | 4,754 | 4,876
Fair value, total | 18,138 | 18,352
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Amortized cost, due within 5 years |  |
Amortized cost, due after 5 years through 10 years | 3,036 | 3,200
Amortized cost, due after 10 years | 3,818 | 4,130
Available-for-sale securities, amortized cost | 6,854 | 7,330
Fair value, due within 5 years |  |
Fair value, due after 5 years through 10 years | 2,900 | 3,107
Fair value, due after 10 years | 3,755 | 4,117
Fair value, total | $ 6,655 | $ 7,224

X
- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the first fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing in the first fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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