Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Letters of Credit Outstanding, Amount	$ 21.6	$ 23.9
Draw Note [Member] \| TBK Bank [Member]
Line of Credit Facility, Remaining Borrowing Capacity	$ 45.0

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant