Note 7 - Other Assets (Details Textual) $ in Thousands	6 Months Ended
	Oct. 31, 2018 USD ($)
Other Assets, Miscellaneous, Total	$ 1,459
Kansas Expanded Lottery Act Contract Privilege [Member]
Other Intangible Assets, Net	5,500
Intangible Gaming Support Items [Member]
Other Intangible Assets, Net	$ 5,426
Finite-Lived Intangible Asset, Useful Life	3 years
JET Autopilot Intellectual Property [Member]
Other Intangible Assets, Net	$ 1,417
Finite-Lived Intangible Asset, Useful Life	15 years