Note 2 - Investments - Mortgage Loans by Property Type (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Total commercial mortgages	$ 3,775,432	$ 3,166,136
Student Housing [Member]
Total commercial mortgages	0	781,512
Condominium [Member]
Total commercial mortgages	2,003,705	1,874,445
Multi-property [Member]
Total commercial mortgages	1,235,750	332,195
Multifamily [Member]
Total commercial mortgages	$ 535,977	$ 177,984