Note 20 - Income Taxes (Details Textual)	12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Nov. 24, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	30.80%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 1,405,000	$ (1,116,000)
Deferred Tax Assets, Valuation Allowance, Total	14,658,000	13,583,000
Delphax [Member]
Business Acquisition, Percentage of Voting Interests Acquired			38.00%
Delphax [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 383,000	973,000
Open Tax Year	2014 2015 2016 2017 2018
Estimated Future Liquidation Loss on Tax Attributes	$ 6,400,000
Deferred Tax Assets, Valuation Allowance, Total	13,000,000	$ 13,000,000
Delphax [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total	13,400,000
Delphax [Member] | Foreign Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	4,500,000
Delphax [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	15,200,000
Delphax [Member] | Domestic Tax Authority [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 311,000
Delphax [Member] | Canada, France, and United Kingdom [Member]
Number of Foreign Subsidiaries	3