Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Construction [Member]
Other Commitment		$ 1.2
Expiration Period Of Letter Of Credit Issued	1 year

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant