Note 8 - Segment Reporting - Active Partner Companies by Segment (Details)	Mar. 31, 2020
Aktana, Inc. [Member]
Ownership Interest Under Equity Method, Percent	17.50%
Clutch Holdings [Member]
Ownership Interest Under Equity Method, Percent	41.20%
Flashtalking [Member]
Ownership Interest Under Other Method, Percent	13.40%
InfoBionic, Inc. [Member]
Ownership Interest Under Equity Method, Percent	25.20%
Lumesis, Inc. [Member]
Ownership Interest Under Equity Method, Percent	43.50%
MediaMath, Inc. [Member]
Ownership Interest Under Other Method, Percent	13.30%
meQuilibrium [Member]
Ownership Interest Under Equity Method, Percent	32.70%
Moxe Health Corporation [Member]
Ownership Interest Under Equity Method, Percent	29.90%
Prognos Health, Inc. [Member]
Ownership Interest Under Equity Method, Percent	28.70%
QuanticMind [Member]
Ownership Interest Under Equity Method, Percent	24.20%
Sonobi [Member]
Ownership Interest Under Equity Method, Percent	21.60%
Syapse, Inc. [Member]
Ownership Interest Under Equity Method, Percent	20.00%
T-Rex Group, Inc [Member]
Ownership Interest Under Other Method, Percent	13.70%
Trice Medical, Inc. [Member]
Ownership Interest Under Equity Method, Percent	16.60%
WebLinc, Inc. [Member]
Ownership Interest Under Equity Method, Percent	38.50%
Zipnosis [Member]
Ownership Interest Under Equity Method, Percent	37.70%