Note 8 - Concentrations (Tables)

12 Months Ended

Mar. 31, 2016

Notes Tables

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

	% of Revenue for Year Ended March 31
	2016			2015			2014
Customer A		23	%		20	%		17	%
Customer B		20	%		16	%		19	%
Customer C		*			14	%		15	%
Customer D		*			12	%		10	%

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

	Year Ended March 31
	2016		2015		2014
United States	$	12,392,053	$	11,919,548	$	11,159,443
Europe		11,392,046		13,779,392		11,065,547
Asia		3,113,484		4,318,209		3,374,202
Other		819,695		566,939		335,715
Total Revenue	$	27,717,278	$	30,584,088	$	25,934,907