Note 10 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($)	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Capitalized Computer Software, Additions	$ 0	$ 266,000
Internal Costs to Develop Software		155,000
Third Party Programmers Costs		111,000
Capitalized Computer Software, Amortization	$ 165,000	$ 1,368,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years