Note 9 - Fair Value Measurements - Schedule of Fair Value Reported on a Recurring Basis (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Equity Securities (Notes 2, 5 & 9)	$ 454,058	$ 559,936
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Available-for-Sale Securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Domestic Equities [Member]
Equity Securities (Notes 2, 5 & 9)	259,843	249,210
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | International Equities [Member]
Equity Securities (Notes 2, 5 & 9)	179,083	271,921
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other [Member]
Equity Securities (Notes 2, 5 & 9)	15,132	38,805
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Available-for-Sale Securities	16,249,414	16,371,544
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Domestic Equities [Member]
Equity Securities (Notes 2, 5 & 9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | International Equities [Member]
Equity Securities (Notes 2, 5 & 9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other [Member]
Equity Securities (Notes 2, 5 & 9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Available-for-Sale Securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Domestic Equities [Member]
Equity Securities (Notes 2, 5 & 9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | International Equities [Member]
Equity Securities (Notes 2, 5 & 9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other [Member]
Equity Securities (Notes 2, 5 & 9)