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Note 2 - Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | March 31, 2018 |  |  | December 31, 2017 |
|  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |  |  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |
Corporate bonds |  | $ | 34,394 |  |  | $ | (36 | ) |  | $ | 34,358 |  |  | $ | 33,778 |  |  | $ | (20 | ) |  | $ | 33,758 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration