Note 4 - Fair Value Measurements - Estimated Fair Values of the Company's Financial Assets and Liabilities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	$ 1,867,891	$ 651,809
Investment income due and accrued	243,756	214,998
Investments, at fair value	34,469,794	33,643,190
Total Financial Assets	36,630,373	34,509,997
Financial Liabilities:
Policyholder deposits in deposit-type contracts	15,113,995	13,448,891
Total Financial Liabilities	15,113,995	13,448,891
Estimate of Fair Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	1,867,891	651,809
Investment income due and accrued	243,756	214,998
Investments, at fair value	34,469,794	33,643,190
Total Financial Assets	36,630,373	34,509,997
Financial Liabilities:
Policyholder deposits in deposit-type contracts	13,617,789	12,508,470
Total Financial Liabilities	$ 13,617,789	$ 12,508,470