Note 5 - Investment in Unconsolidated Affiliates (Details Textual) - DTDW [Member]	Dec. 31, 2021
Equity Method Investment, Ownership Percentage	40.00%
Equity Method Investment, Ownership Percentage by Other Owners	60.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

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Balance Type:	na
Period Type:	instant