Note 3 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Nov. 24, 2015	Sep. 30, 2015	Nov. 25, 2014
Delphax [Member]
Business Acquisition, Percentage of Voting Interests Acquired			38.00%
Delphax [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards				$ 6,000,000
Tax Credit Carryforward, Amount	$ 4,500,000
Delphax [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount				4,500,000
Delphax [Member] | Domestic Tax Authority [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount				325,000
Delphax [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards				$ 7,900,000
Tax Credit Carryforward, Amount	3,200,000
Income Tax Expense (Benefit)	$ (372,000)	$ (333,000)
Effective Income Tax Rate Reconciliation, Percent	4.40%	34.30%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%
Deferred Tax Assets, Valuation Allowance	$ 12,772,000				$ 11,661,000