Note 8 - Revenue By Major Customers (Details) - Sales Revenue, Net [Member] |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Mar. 31, 2014 |
|
| Customer A [Member] | |||
| Percentage of concentration | 23.00% | 20.00% | 17.00% |
| Customer B [Member] | |||
| Percentage of concentration | 20.00% | 16.00% | 19.00% |
| Customer C [Member[ | |||
| Percentage of concentration | 14.00% | 15.00% | |
| Customer D [Member] | |||
| Percentage of concentration | 12.00% | 10.00% | |