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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
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Mar. 31, 2018
Number of Operating Segments | 4
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 | 59.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member] |
Concentration Risk, Percentage | 41.00%

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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