Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	10 Months Ended
Oct. 21, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Proceeds from Insurance Settlement, Investing Activities		$ 9,838	$ 0	$ 21,800
Subsequent Event [Member]
Proceeds from Insurance Settlement, Investing Activities	$ 700

Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21B
-URI http://asc.fasb.org/extlink&oid=121586364&loc=SL94080549-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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