Note 4 - Investments - Cost or Amortized Cost and Estimated Fair Value of Fixed Maturity Investments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Due in one year or less, amortized cost	$ 2,539,709	$ 4,434,013
Due in one year or less, fair value	2,542,229	4,429,510
Due after one year through five years, amortized cost	12,518,738	9,851,410
Due after one year through five years, fair value	12,619,593	9,644,270
Due after five years through ten years, amortized cost	506,240	521,004
Due after five years through ten years, fair value	506,495	514,300
Total, amortized cost	15,564,687	14,806,427
Total, fair value	$ 15,668,317	$ 14,588,080