Note 3 - Antidilutive Securities (Details) - shares	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Basic and diluted (in shares)	18,903,466	18,220,775
Potentially dilutive (in shares)	22,604	47,500

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 28A
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1500-109256

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration