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Note 2 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 8,458 |  |  | $ | 19 |  |  | $ | (49 | ) |  | $ | 8,428 |
Municipal bonds |  |  | 4,637 |  |  |  | 1 |  |  |  | (28 | ) |  |  | 4,610 |
Total available-for-sale securities |  | $ | 13,095 |  |  | $ | 20 |  |  | $ | (77 | ) |  | $ | 13,038 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 20,028 |  |  | $ | 64 |  |  | $ | (122 | ) |  | $ | 19,970 |
Municipal bonds |  |  | 6,463 |  |  |  | 6 |  |  |  | (44 | ) |  |  | 6,425 |
Total available-for-sale securities |  | $ | 26,491 |  |  | $ | 70 |  |  | $ | (166 | ) |  | $ | 26,395 |
Available-for-sale Securities, Debt Maturities [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due within one year |  | $ | 2,688 |  |  | $ | 2,688 |
Due after one year through five years |  |  | 10,408 |  |  |  | 10,350 |
Total available-for-sale securities |  | $ | 13,096 |  |  | $ | 13,038 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 months |  |  | More than 12 months |  |  | Total |
|  | Estimated fair value |  |  | Gross unrealized holding losses |  |  | Estimated fair value |  |  | Gross unrealized holding losses |  |  | Estimated fair value |  |  | Gross unrealized holding losses |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 3,799 |  |  | $ | (20 | ) |  |  | 2,125 |  |  | $ | (30 | ) |  | $ | 5,924 |  |  | $ | (50 | )
Municipal bonds |  |  | 3,341 |  |  |  | (18 | ) |  |  | 657 |  |  |  | (9 | ) |  |  | 3,998 |  |  |  | (27 | )
|  | $ | 7,140 |  |  | $ | (38 | ) |  | $ | 2,782 |  |  | $ | (39 | ) |  | $ | 9,922 |  |  | $ | (77 | )

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