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Note 14 - Available-for-sale Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Debt Securities, Available-for-sale [Table Text Block] |
(in thousands) |  | December 31, 2018 |
|  | Amortized cost basis |  |  | Gross unrealized losses (less than 12 months) |  |  | Fair value |
US corporate securities, maturing within one to five years |  | $ | 396 |  |  | $ | (3 | ) |  | $ | 393 |
Certificates of deposit, maturing in less than one year |  |  | 600 |  |  |  | (1 | ) |  |  | 599 |
Certificates of deposit, maturing within one to five years |  |  | 500 |  |  |  | (3 | ) |  |  | 497 |
Total available-for-sale securities |  | $ | 1,496 |  |  | $ | (7 | ) |  | $ | 1,489 |

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- Definition Tabular disclosure 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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