Note 3 - Acquisitions of Ownership Interests (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Payments to Acquire Equity Method Investments			$ 5,010	$ 6,000
Equity Method Investments	$ 29,878		29,878		$ 34,542
meQuilibrium [Member]
Convertible Bridge Loan			1,000
Payments to Acquire Equity Method Investments				$ 13,000
Syapse, Inc. [Member]
Payments to Acquire Equity Method Investments	4,400	$ 600
Equity Method Investments	20,600		20,600
Trice Medical [Member]
Payments to Acquire Equity Method Investments			700
Equity Method Investments	10,200		10,200
Clutch Holdings [Member]
Payments to Acquire Equity Method Investments			200
Equity Method Investments	16,700		16,700
QuanticMind [Member]
Convertible Bridge Loan			200
Equity Method Investments	13,500		13,500
WebLinc, Inc. [Member]
Convertible Bridge Loan			100
Equity Method Investments	$ 16,100		$ 16,100