Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 394	$ 408
Assets on lease, accumulated depreciation	5,780
Assets on lease, accumulated depreciation		6,689
Property and equipment, accumulated depreciation	4,104	3,470
Intangible assets, accumulated amortization	$ 2,303	$ 2,097
Preferred stock, par value (in dollars per share)	$ 1	$ 1
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)	3,023,085	2,022,637
Common stock, shares outstanding (in shares)	2,912,599	2,022,637
Treasury stock, shares (in shares)	110,146
Treasury stock, price per share (in dollars per share)	$ 19.58