Note 15 - Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Costs Capitalized Adjustment	$ 0	$ 0	$ 0

Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

No definition available.

Name:	us-gaap_InterestCostsCapitalizedAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration