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Note 16 - Concentration of Credit Risk | 6 Months Ended
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Oct. 31, 2018
Notes to Financial Statements |
Concentration of Credit Risk [Text Block] | Note 16 - 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. As of October 31, 2018 and October 31, 2017, the Company had $826,000 and $1,233,000, respectively, in excess of the FDIC insured limit.

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