(9) Concentrations (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
First major customer
Entity-wide revenue, major customer, amount	$ 23,938,000	$ 20,205,000	$ 43,524,000	$ 41,842,000
Entity wide revenue major customer percent	72.00%	61.00%	68.00%	61.00%
Accounts receivable, net	14,846,000	9,629,000	14,846,000	9,629,000	5,802,000
Second largest customer
Entity-wide revenue, major customer, amount	3,233,000	5,288,000	7,218,000	11,180,000
Entity wide revenue major customer percent	10.00%	16.00%	11.00%	16.00%
Accounts receivable, net	$ 1,167,000	$ 2,370,000	$ 1,167,000	$ 2,370,000	$ 1,783,000