Note 15 - Subsequent Event (Details Textual) $ in Millions	6 Months Ended
Jun. 30, 2016 USD ($)
Scenario, Forecast [Member] \| Volatile Analysis Corporation [Member]
Proceeds from Sales of Business, Affiliate and Productive Assets	$ 1.3

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

No definition available.

Name:	us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration