Note 13 - Long-term Incentive Plan - Information on Outstanding Grants Made to Employees Under the LTIP (Details) - Long-Term Incentive Plan [Member] - Phantom Share Units (PSUs) [Member] - Employees [Member] - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Granted, number of units (in shares)	46,168	524,997	396,536	323,339
Granted, weighted average grant date fair value (in dollars per share)	$ 1.08	$ 1.14	$ 4.77	$ 7.15
Grant Date Total Fair Value	$ 50	$ 598	$ 1,891	$ 2,312