Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Current Assets:
Allowance for Doubtful Receivables and Sales Returns	$ 3.6	$ 2.5
Equity:
Common Stock, par value (in dollars per share)	$ 0.375	$ 0.375
Common Stock, authorized (in shares)	60,000,000	60,000,000
Common Stock, issued (in shares)	18,336,010	18,125,201
Common Stock, outstanding (in shares)	18,336,010	18,125,201
Preferred Stock, Par or Stated Value Per Share	$ 0.02		$ 0.02
Preferred Stock, Shares Authorized	1,000,000		1,000,000
Preferred Stock, Shares Issued	0		0
Preferred Stock, Shares Outstanding	0		0