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

The Company's standard payment terms.

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- Definition

The percentage of Net Income (Loss) attributable to noncontrolling interest.

+ References

No definition available.

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- Definition

The number of major customers.

+ References

No definition available.

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- Definition

Represents the percentage of dividends paid by consolidated subsidiaries that attributable to noncontrolling interest.

+ References

No definition available.

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- Definition

Represents the percentage of dividends paid by consolidated subsidiaries that are attributable to parent.

+ References

No definition available.

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- Definition

Warranty term

+ References

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Revenue from transporting cargo and freight between locations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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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

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