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Note 8 - Marketable Securities | 6 Months Ended
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Jun. 30, 2017
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 8. Marketable Securities During the six months ended June 30, 2017, the Company acquired available-for-sale marketable equity securities for an aggregate purchase price of $9.8 million. At June 30, 2017, the Company’s investment in marketable securities was $14.5 million, which includes an aggregate unrealized loss of $1.2 million relating to marketable equity security investments.

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