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Note 14 - Available-for-sale Securities - Available-for-sale Securities (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Available-for-sale securities, amortized cost | $ 1,496,000 |
Available-for-sale securities, gross unrealized losses | (3,000) |
Available-for-sale securities, fair value | 1,493,000 |
Debt Security, Corporate, US [Member] |  |
Available-for-sale securities, amortized cost | 396,000 |
Available-for-sale securities, gross unrealized losses | (2,000) |
Available-for-sale securities, fair value | 394,000 |
Certificates of Deposit [Member] |  |
Available-for-sale securities, amortized cost | 600,000 |
Available-for-sale securities, gross unrealized losses | 0 |
Available-for-sale securities, fair value | 600,000 |
Certificates of Deposit, Maturing Within One to Five Years [Member] |  |
Available-for-sale securities, amortized cost | 500,000 |
Available-for-sale securities, gross unrealized losses | (1,000) |
Available-for-sale securities, fair value | $ 499,000 |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -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). + 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 Amount 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 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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