Note 1 - General (Details Textual) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents, at Carrying Value, Total	$ 13,331	$ 24,739
Marketable Securities, Total	6,000
Debt Securities, Trading, and Equity Securities, FV-NI, Total	860	4,549
Lessee, Operating Lease, Discount Rate			12.00%
Operating Lease, Cost	500	500
Operating Lease, Payments	$ 600	$ 600
Bright Health [Member]
Investment Owned, Balance, Shares (in shares)	1.3
Debt Securities, Trading, and Equity Securities, FV-NI, Total	$ 900