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Reinsurance (Tables)
 12 Months Ended
Mar. 31, 2018
Insurance [Abstract]  
Reinsurance Effect on Premiums Written and Earned
The effects of reinsurance on premiums written and earned are as follows (in thousands):
 
Year Ended
 
March 31, 2018
 
April 1, 2017
 
Written
 
Earned
 
Written
 
Earned
Direct premiums
$
16,703

 
$
16,493

 
$
16,528

 
$
15,919

Assumed premiums—nonaffiliate
24,614

 
25,010

 
25,332

 
23,908

Ceded premiums—nonaffiliate
(12,924
)
 
(12,924
)
 
(12,247
)
 
(12,247
)
Net premiums
$
28,393

 
$
28,579

 
$
29,613

 
$
27,580