Note 8 - Concentrations (Tables)

12 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

	% of Revenue for Year Ended March 31
	2017			2016			2015
Customer A		22	%		23	%		20	%
Customer B		20	%		20	%		16	%
Customer C		*			*			14	%
Customer D		*			*			12	%

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	Year Ended March 31
	2017		2016		2015
United States	$	13,600,236	$	12,392,053	$	11,919,548
Europe, the Middle East, and Africa		9,612,883		11,392,046		13,779,392
Asia-Pacific		4,200,934		3,113,484		4,318,209
Rest of World		912,143		819,695		566,939
Total Revenue	$	28,326,196	$	27,717,278	$	30,584,088