Note 19 - Employee Benefits (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Payment for Pension and Other Postretirement Benefits, Total	$ 559,000	$ 529,000
Foreign Plan [Member] | CANADA
Deferred Compensation Arrangement with Individual, Requisite Service Period	2 years
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	78,000
Foreign Plan [Member] | CANADA | Minimum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Foreign Plan [Member] | CANADA | Maximum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Foreign Plan [Member] | Delphax [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	2.00%
Parent Company [Member]
Profit Sharing Expense	$ 602,000
Contrail Aviation Inc. [Member]
Profit Sharing Expense	536,000
General and Administrative Expense [Member]
Other Labor-related Expenses	$ 1,188,000	$ 390,000