Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012
Segment Information [Abstract]
Number of operating segments			2
Segment Reporting Information [Line Items]
Total revenues	$ 2,006	$ 4,483	$ 7,693	$ 7,036
Income (loss) from operations	(92)	725	1,319	(171)
Depreciation and amortization	46	36	133	102
Segment assets	10,156	8,000	10,156	8,000	7,982
Gaming Business [Member]
Segment Reporting Information [Line Items]
Total revenues	1,724	2,242	5,356	4,090
Income (loss) from operations	185	409	1,350	49
Depreciation and amortization	27	23	83	64
Segment assets	8,214	6,010	8,214	6,010
Voting Business [Member]
Segment Reporting Information [Line Items]
Total revenues	282	2,241	2,337	2,946
Income (loss) from operations	(277)	316	(31)	(220)
Depreciation and amortization	19	13	50	38
Segment assets	$ 1,942	$ 1,990	$ 1,942	$ 1,990