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Note 13 - Segment Data (Details) - Revenues from External Customers (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Revenues from unaffiliated customers
Revenues from unaffiliated customers	$ 15,714	$ 13,116	$ 12,676	$ 11,218	$ 12,808	$ 11,361	$ 11,706	$ 10,560	$ 10,968	$ 9,649	$ 9,702	$ 9,297	$ 52,724	$ 46,435	$ 39,616
UNITED STATES
Revenues from unaffiliated customers
Revenues from unaffiliated customers													29,551	28,590	23,770
Foreign [Member]
Revenues from unaffiliated customers
Revenues from unaffiliated customers													$ 23,173	$ 17,845	$ 15,846

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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