Note 6 - Financial Instruments and Fair Value - Pre-tax Effect of Interest Rate Swaps (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Long-lived assets held for sale, fair value	$ 2,269

Fair value portion of assets classified as held for sale.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant