Note 14 - Stockholders' Equity - Summary of 2001 Plan for Restricted Stock Grants (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allocated Share-based Compensation Expense	$ 1,800,000	$ 1,200,000	$ 800,000
Restricted Stock [Member]
Shares awarded to each non-employee director (in shares)	59,240	60,675	43,421
Average grant-date market price per share (in dollars per share)	$ 4.22	$ 4.12	$ 8.06
Allocated Share-based Compensation Expense	$ 250,000	$ 250,000	$ 350,000
Compensation cost recognized related to current and prior year awards	$ 249,995	$ 266,667	$ 316,750
Restricted Stock [Member] \| Non Employee Director [Member]
Shares awarded to each non-employee director (in shares)	11,848	12,135	6,203

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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