Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,177	$ 680
Assets on lease, accumulated depreciation	436	6,526
Property and equipment, accumulated depreciation	$ 4,510	$ 4,319
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	50,000	50,000
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	4,000,000	4,000,000
Common stock, shares issued (in shares)	3,022,745
Common stock, shares outstanding (in shares)	2,881,853
Treasury stock (shares)	140,892	140,892
Treasury stock, average price per share (in dollars per share)	$ 18.58	$ 18.58