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Note 4 - Income Taxes (Details Textual)
3 Months Ended 6 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jul. 18, 2016
Nov. 24, 2015
USD ($)
Effective Income Tax Rate Reconciliation, Percent     (0.10%) 30.90%    
Income Tax Expense (Benefit) $ 375,000 $ 1,701,000 $ 3,000 $ 1,368,000    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00%        
Deferred Tax Assets, Valuation Allowance $ 12,770,000   $ 12,770,000     $ 11,661,000
Delphax [Member] | Foreign Tax Authority [Member]            
Operating Loss Carryforwards   $ 6,000,000   6,000,000    
Delphax [Member] | Foreign Tax Authority [Member] | Research Tax Credit Carryforward [Member]            
Tax Credit Carryforward, Amount   4,500,000   4,500,000    
Delphax [Member] | Domestic Tax Authority [Member]            
Operating Loss Carryforwards   7,900,000   7,900,000    
Delphax [Member] | Domestic Tax Authority [Member] | Alternative Minimum Tax Credit Carryforward [Member]            
Tax Credit Carryforward, Amount   325,000   325,000    
Delphax Canada [Member] | Foreign Tax Authority [Member]            
Operating Loss Carryforwards   $ 3,200,000   $ 3,200,000    
Canada, France, and United Kingdom [Member]            
Number of Foreign Subsidiaries 3   3      
Delphax [Member]            
Business Acquisition, Percentage of Voting Interests Acquired           38.00%
Contrail Aviation Inc. [Member] | Contrail Aviation Support LLC. [Member]            
Business combination, Equity Interests in Acquiree, Percentage         21.00%  
Business Combination, Equity Interest in Acquiree, Deemed to be Acquired, Percentage         79.00%