Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)	Dec. 31, 2019
Entity Number of Employees		330
Collective Bargaining Arrangements		9
General and Administrative Expense [Member]
Litigation Settlement, Expense	$ 1

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

No definition available.

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