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Note 9 - Investment in Marketable Securities (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Minimum [Member]
Marketable Securities, Contractual Maturities	15 years	15 years
Maximum [Member]
Marketable Securities, Contractual Maturities	30 years	30 years
Marketable Securities Estimated Yield	2.00%	2.00%
Marketable Securities Adjusted Duration	4 years	4 years
Proceeds from Principal Repayments on Loans and Leases Held-for-investment	$ 643,609

X

- Definition

Marketable securities adjusted duration

+ References

No definition available.

+ Details

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- Definition

The contractual maturity date of marketable securities.

+ References

No definition available.

+ Details

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X

- Definition

Approximate yield of marketable securities based on amortized cost.

+ References

No definition available.

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X

- Definition

The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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