Consolidated Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2022	Mar. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	12,673,000	12,653,000
Common stock, shares outstanding	7,546,000	7,708,000
Treasury stock, shares	5,127,000	4,945,000