Note 11 - Commitments and Contingencies (Details Textual) - Brinderson L.P. [Member] - Pre-Acquisition Matters [Member] - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Loss Contingency Accrual, Ending Balance		$ 4.0
Loss Contingency Accrual, Payments	$ 4.3
Loss Contingency Accrual, Provision	$ 0.3

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

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