Note 2 - Ownership Interests and Advances (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Equity Securities without Readily Determinable Fair Value, Amount	$ 33,101	$ 19,951
Preferred Equity in Acquiror in Connection with Sale of Zipnosis, Inc [Member]
Equity Securities without Readily Determinable Fair Value, Amount	15,300
Zipnosis [Member]
Proceeds from Sale of Equity Method Investments	3,300
Equity Method Investment, Realized Gain (Loss) on Disposal, Total	17,000
WebLinc, Inc. [Member]
Proceeds from Sale of Equity Method Investments	3,200
Equity Method Investment, Realized Gain (Loss) on Disposal, Total	$ (500)
Disposal Group, Including Discontinued Operation, Period of Contingent Proceeds (Month)	24 months
T-Rex Group, Inc [Member]
Proceeds From Sale of Other Method Investment	$ 3,000
Other Method Investment, Gain (Loss)	$ 700