Note 3 - Income Taxes (Details Textual)	3 Months Ended		9 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 18, 2016	Nov. 24, 2015 USD ($)	Sep. 30, 2015 USD ($)
Effective Income Tax Rate Reconciliation, Percent			24.17%	34.25%
Deferred Tax Assets, Valuation Allowance	$ 12,352,000		$ 12,352,000			$ 11,661,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%		34.00%
Income Tax Expense (Benefit)	$ 149,000	$ 1,499,000	$ 152,000	$ 2,867,000
Canada, France, and United Kingdom [Member]
Number of Foreign Subsidiaries	3		3
Delphax [Member]
Business Acquisition, Percentage of Voting Interests Acquired						38.00%
Delphax [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards							$ 6,000,000
Delphax [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards							7,900,000
Delphax [Member]
Effective Income Tax Rate Reconciliation, Percent			(2.99%)
Delphax [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward, Amount	$ 3,200,000		$ 3,200,000
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] | 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
Contrail Aviation Support LLC. [Member] | Contrail Aviation Inc. [Member]
Business combination, Equity Interests in Acquiree, Percentage					21.00%
Business Combination, Equity Interest in Acquiree, Deemed to be Acquired, Percentage					79.00%