Note 10 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($)	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Capitalized Computer Software, Additions	$ 266,000	$ 518,000
Internal Costs to Develop Software	155,000	375,000
Third Party Programmers Costs	111,000	143,000
Capitalized Computer Software, Amortization	$ 1,368,000	$ 635,000