Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details Textual)

v3.21.1
Capital Stock and Stock Restrictions (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
May 14, 2021
May 17, 2017
Class of Stock [Line Items]          
Payments for Repurchase of Common Stock $ 7,200 $ 7,283 $ 192    
Treasury Stock, Shares, Acquired 4,900,000        
Treasury Stock Acquired, Average Cost Per Share $ 1.48        
Preferred Stock, Shares Authorized   1,000,000 1,000,000    
Stock Repurchase Program Remaining Authorized Repurchases Amount   $ 700      
Class A Common Stock [Member]          
Class of Stock [Line Items]          
Treasury Stock, Shares, Acquired   4,954,300 93,039    
Common Stock, Shares, Outstanding   7,521,271 12,224,450    
Class B Common Stock [Member]          
Class of Stock [Line Items]          
Common Stock, Shares, Outstanding   3,484,287 3,484,287    
2017 authorization [Member] | Class A Common Stock [Member]          
Class of Stock [Line Items]          
Stock Repurchase Program, Remaining Authorized Repurchase Amount         $ 2,000
2011 Authorization [Member] | Class A Common Stock [Member]          
Class of Stock [Line Items]          
Stock Repurchase Program Remaining Authorized Repurchases Amount     $ 100    
Outside of Publically Announced Repurchase Program [Member] | Class A Common Stock [Member]          
Class of Stock [Line Items]          
Treasury Stock Acquired, Average Cost Per Share   $ 0.81 $ 2.06    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation   69,520 93,039    
2017 Authorization | Class A Common Stock [Member]          
Class of Stock [Line Items]          
Treasury Stock Acquired, Average Cost Per Share   $ 0 $ 0    
Voting trust and other trusts [Member] | Class B Common Stock [Member]          
Class of Stock [Line Items]          
Common Stock, Shares, Outstanding   3,484,287      
Subsequent Event [Member] | Voting Trust [Member]          
Class of Stock [Line Items]          
Voting Control       60.00%  
Subsequent Event [Member] | Voting trust and other trusts [Member]          
Class of Stock [Line Items]          
Voting Control       65.20%