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Note 17 - Concentration of Credit Risk
12 Months Ended
Apr. 30, 2021
Notes to Financial Statements  
Concentration of Credit Risk [Text Block]
Note
17
- Concentration of Credit Risk:
 
 
Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash deposits. Accounts at each institution are insured by the Federal Deposit Insurance Corporation (“FDIC”) up to
$250,000.
  At
April 30, 2021
and
2020,
the Company had
$2,742,000
and
$5,202,000,
respectively, in excess of the FDIC insured limit.  Management has concluded the excess does
not
represent a material risk, based on the creditworthiness  of the counter parties.