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, 2019	Mar. 31, 2019	Mar. 31, 2018	May 17, 2019	May 17, 2017	Mar. 31, 2017	Aug. 31, 2011
Class of Stock [Line Items]
Stock Repurchase Program Remaining Authorized Repurchases 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		489,000	193,000
Common Stock, Shares, Outstanding		11,909,979	12,145,743			12,015,000
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		426,283	133,608
Treasury Stock Acquired, Average Cost Per Share		$ 2.43	$ 2.98
2011 Authorization [Member] \| Class A Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 20.0
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		$ 3.18	$ 2.92
Shares Paid for Tax Withholding for Share Based Compensation		62,260	59,648
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				49.80%
Subsequent Event [Member] \| Voting trust and other trusts [Member]
Class of Stock [Line Items]
Voting Control				53.90%
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		412,500	570,000
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	100,000
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		50,000	40,000
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	100,000