Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands	Dec. 31, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	12,673	12,653
Common stock, shares outstanding	7,585	7,708
Treasury stock, shares	5,088	4,945
Recourse to assets	$ 0