Note 8 - Revenue By Geographic Region (Details) - USD ($)	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
UNITED STATES
Revenue	$ 12,392,053	$ 11,919,548	$ 11,159,443
Europe [Member]
Revenue	11,392,046	13,779,392	11,065,547
Asia [Member]
Revenue	3,113,484	4,318,209	3,374,202
Other Areas [Member]
Revenue	819,695	566,939	335,715
Revenue	$ 27,717,278	$ 30,584,088	$ 25,934,907

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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=63488584&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration