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Note 11 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities | $ 4,715 | $ 13,038
Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities | 4,715 | 13,038
Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |
Corporate Debt Securities [Member] |  |
Available-for-sale securities | 2,881 | 8,428
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities | 2,881 | 8,428
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities | 1,834 | 4,610
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities | 1,834 | 4,610
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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