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Note 3 - Income Taxes (Details Textual) |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 02, 2017 USD ($) | Jul. 18, 2016 USD ($) | Nov. 24, 2015 USD ($) | May 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($)
Income Tax Expense (Benefit) |  |  |  |  | $ 374,000 | $ (372,000) |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  | 23.30% | 4.40% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 34.00% |  |
Estimated Future Liquidation Loss on Tax Attributes |  |  |  |  | $ 2,900,000 |  |
Deferred Tax Assets, Valuation Allowance |  |  | $ 11,661,000 |  | 13,809,000 | $ 12,772,000 |
Deferred Income Tax Expense (Benefit) |  |  |  |  | (501,880) |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net |  |  |  |  | $ 501,880 |  |
Canada, France, and United Kingdom [Member] |  |  |  |  |  |  |
Number of Foreign Subsidiaries |  |  |  |  | 3 |  |
Delphax [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 38.00% |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 1,050,000 |  |  |  |
Delphax [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  | $ 6,300,000
Delphax [Member] | Domestic Tax Authority [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  | 13,200,000
Delphax [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount |  |  |  |  |  |  | 4,300,000
Delphax [Member] | Domestic Tax Authority [Member] | Alternative Minimum Tax Credit Carryforward [Member] |  |  |  |  |  |  |
Tax Credit Carryforward, Amount |  |  |  |  |  |  | $ 311,000
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% |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 4,033,368 |  |  |  |  |
Acquired Inventory and Principal Business Assets, and Assumed Specified Liabilities, of Aircraft Instrument and Radio Company, Incorporated, and Aircraft Instrument and Radio Services, Inc. [Member] | AirCo [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 2,400,000 |  |  | $ 2,400,000 |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount | $ 779,880 |  |  |  |  |  |
Deferred Tax Liabilities, Net |  |  |  |  | $ 278,000 |  |
Deferred Income Tax Expense (Benefit) |  |  |  |  | 278,000 |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount, Net |  |  |  |  | $ 502,000 |  |

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