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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