Employee Benefit Plans	3 Months Ended
	Jun. 30, 2021
Compensation and Retirement Disclosure [Abstract]
13. Employee Benefit Plans	13. Employee Benefit Plans The components of the net periodic benefit costs with respect to postretirement benefits were as follows:       Quarter Ended June 30,     2021   2020     (Unaudited)     (In thousands)           Service cost for benefits earned during the period $ 350 $   317 Other components of net periodic benefit costs:         Interest cost on accumulated postretirement benefit   227   230 Other components   53   17 Total other components of net periodic benefit costs   280   247 Net periodic postretirement benefit cost $ 630 $   564