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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% |

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