Note 5 - Fair Value of Assets and Liabilities - Assets Measured at Fair Value (Details) (Parentheticals) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Investments in securities, cost	$ 5,802,395	$ 2,265,489

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

No definition available.

Name:	us-gaap_EquitySecuritiesFvNiCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant