Derivatives (Table Text Block)	9 Months Ended
	Dec. 31, 2019
Derivative Instrument Detail [Abstract]
Derivatives	Derivatives Fair Values as of     December 31, 2019   March 31, 2019     (Unaudited)     (In thousands) Interest rate contracts designated as hedging instruments:         Assets $ – $ 139 Liabilities $ 1,415 $ – Notional amount $ 235,000 $ 22,792
Effect of Interest Rate Contracts on the Statement of Operations	The Effect of Interest Rate Contracts on the Statements of Operations for the Quarters Ended         December 31, 2019   December 31, 2018     (Unaudited)     (In thousands) (Gain) loss recognized in AOCI on interest rate contracts $ 1,558 $ (731) (Gain) loss reclassified from AOCI into income $ (458) $ 789