Note 13 - Lease Arrangements (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Leases, Rent Expense, Total	$ 4,564,000	$ 4,520,000
Delphax [Member]
Operating Leases, Rent Expense, Total	13,000	95,000
Related Party [Member]
Operating Leases, Rent Expense, Total	$ 201,000	$ 337,000