Note 5 - Investments - Details Investments by Major Investment Category (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized costs	$ 5,564
Gross unrealized gains	0
Gross unrealized losses	0
Total	5,564	$ 0
US Government Agencies Debt Securities [Member]
Amortized costs	4,314
Gross unrealized gains	0
Gross unrealized losses	0
Total	4,114
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Amortized costs	1,000
Total	1,000
Common Stock [Member]
Amortized costs	250
Total	250
Gross unrealized gains	0
Gross unrealized losses	$ 0