Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) |
12 Months Ended |
|---|---|
Mar. 31, 2017 | |
| Number of Operating Segments | 4 |
| Number of Physical Locations in Which Entity is Organized | 9 |
| Finite-Lived Intangible Asset, Useful Life | |
| Maximum [Member] | |
| Finite-Lived Intangible Asset, Useful Life | 16 years |
| Minimum [Member] | |
| Finite-Lived Intangible Asset, Useful Life | 3 years |
| Building [Member] | Maximum [Member] | |
| Property, Plant and Equipment, Useful Life | 40 years |
| Machinery and Equipment [Member] | Maximum [Member] | |
| Property, Plant and Equipment, Useful Life | 7 years |
| Computer Equipment [Member] | Maximum [Member] | |
| Property, Plant and Equipment, Useful Life | 3 years |
| Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES | |
| Concentration Risk, Percentage | 57.00% |
| Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member] | |
| Concentration Risk, Percentage | 43.00% |