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Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use	12 Months Ended
	Apr. 30, 2021
Notes to Financial Statements
Internal Use Software Disclosure [Text Block]	Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use: The Company has adopted the provisions of the Statement of Position 98 - 1 (SOP 98 - 1 ), "Accounting for the Costs of Computer Software Developed for Internal Use". SOP 98 - 1 requires companies to capitalize as long-lived assets many of the costs associated with developing or purchasing software for internal use and amortize those costs over the software's estimated useful life in a systematic and rational manner. Such costs, when incurred, are capitalized and amortized over the expected useful life of the asset, normally 3 to 5 years. During the twelve months ended April 30, 2021, the Company capitalized $145,000 related to the third party programmers' costs. The Company did not incur and did not capitalize expenditures related to the development of software for internal use during the twelve months ended April 30, 2021, April 30, 2020 or April 30, 2019. The Company did not incur and did not capitalize expenditures related to third party programmers' costs during the twelve months ended April 30, 2020. During the twelve months ended April 30, 2019 the Company capitalized $111,000 related to the third party programmers' costs. Total amortization expenses for the years ended April 30, 2021, 2020 and 2019 were $70,000, $65,000 and $131,000, respectively.