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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accounts Receivable Payment Terms | 30 days |
Warranty Term on Ground Equipment Products | 3 years |
Research and Development Expense | $ 1,042,496 | $ 777,942
Equipment Leased to Other Party [Member] |  |
Property, Plant and Equipment, Useful Life | 10 years |
Delphax [Member] |  |
Asset Retirement Obligation | $ 560,000 |
Delphax [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Delphax [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 7 years |
Delphax [Member] |  |
Percentage of Consolidated Subsidiaries Dividends Attributable to Parent | 67.00% |
Percentage of Consolidated Subsidiaries Dividends Attributable to Noncontrolling Interests | 33.00% |
Net Income (Loss) Attributable to Noncontrolling Interest, Percentage | 33.00% | 30.00%
Overnight Air Cargo [Member] |  |
Number of Major Customers | 1 |
Cargo and Freight Revenue | $ 23,379,000 | $ 24,632,000

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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