Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,513	$ 1,177
Assets on lease, accumulated depreciation	728	436
Property and equipment, accumulated depreciation	$ 5,111	$ 4,510
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	3,022,745
Common stock, shares outstanding (in shares)	2,881,853	2,881,853
Treasury stock (in shares)	140,892	140,892
Treasury stock average price (in dollars per share)	$ 18.58	$ 18.58