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Note 2 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	Feb. 22, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares
Number of Variable Interest Entity		1
Maximum Maturity Period for Cash Equivalents		90 days
Number of Investment Portfolios		3
Minimum Tax Benefit Likely of Being Realized Upon Ultimate Settlement With Tax Authority, Percentage		50.00%
Number of Reportable Segments		2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		97,000	96,150
Number of Securities Held as Trading Securities		0	0
Non Qualified Stock Options [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	64,600
Restricted Stock [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	7,533
Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life		40 years

X

- Definition

Represents the maximum maturity period for cash equivalents.

+ References

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- Definition

Represents the minimum tax benefit likely of being realized upon ultimate settlement with tax authority percentage.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Net number of non-option equity instruments granted to participants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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