Condensed Consolidated Balance Sheets (Current Period Unaudited)-parentheticals (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2022	Mar. 31, 2022
Accounts Receivable, Allowance for Credit Loss, Current	$ 36	$ 39
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized (in shares)	5,000	5,000
Preferred Stock, Shares Issued (in shares)	3	3
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	3	3
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 4	$ 4
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized (in shares)	40,000	40,000
Common Stock, Shares, Issued (in shares)	20,989	20,979
Common Stock, Shares, Outstanding, Ending Balance (in shares)	20,989	20,979