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Note 9 - Fair Value Measurement - Schedule of Fair Value Reported on a Recurring Basis (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Available-for-Sale Securities (Notes 2 & 5)	$ 13,443,636	$ 8,642,053
Trading Securities	473,707	410,724
US Treasury Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-Sale Securities (Notes 2 & 5)		8,642,053
US Treasury Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Available-for-Sale Securities (Notes 2 & 5)
US Treasury Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-Sale Securities (Notes 2 & 5)	13,443,636
US Treasury Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Available-for-Sale Securities (Notes 2 & 5)
Domestic Equities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Trading Securities	333,516	292,820
Domestic Equities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Trading Securities
Domestic Equities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Trading Securities
International Equities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Trading Securities	83,948	100,920
International Equities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Trading Securities
International Equities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Trading Securities
Other [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Trading Securities	56,243	16,984
Other [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Trading Securities
Other [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Trading Securities