Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details Textual)

Capital Stock and Stock Restrictions (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	May 18, 2020	Mar. 31, 2018	May 17, 2017
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 0.7
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized		1,000,000	1,000,000
Class A Common Stock [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired		92,000	489,000
Common Stock, Shares, Outstanding		12,224,450	11,909,979		12,146,000
Class B Common Stock [Member]
Class of Stock [Line Items]
Common Stock, Shares, Outstanding		3,484,287	3,484,287		3,484,000
2017 authorization [Member] \| Class A Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount						$ 2.0
Treasury Stock, Shares, Acquired		0	426,283
Treasury Stock Acquired, Average Cost Per Share			$ 2.43
August Two Thousand Eleven Authorization [Member] \| Class A Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program Remaining Authorized Repurchases Amount						$ 0.1
Outside of Publically Announced Repurchase Program [Member] \| Class A Common Stock [Member]
Class of Stock [Line Items]
Treasury Stock Acquired, Average Cost Per Share		$ 2.06	$ 3.18
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		93,039	62,260
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				49.30%
Subsequent Event [Member] \| Voting trust and other trusts [Member]
Class of Stock [Line Items]
Voting Control				53.50%
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		301,037	412,500
Restricted Stock Units (RSUs) [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	300,000
Performance Shares [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		216,144	50,000
Performance Shares [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	200,000