CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data	3 Months Ended				6 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Sales of product and services	$ 252,688		$ 221,275		$ 454,654		$ 396,885
Lease revenue	7,305		8,835		14,739		19,264
Fee and other income	2,857		2,782		5,001		5,760
Patent Settlement income	0		125		0		125
TOTAL REVENUES	262,850		233,017		474,394		422,034
COSTS AND EXPENSES
Cost of sales, product and services	217,624		189,427		390,943		340,266
Direct lease costs	2,078		1,856		4,174		4,690
Total cost of sales	219,702		191,283		395,117		344,956
Professional and other fees	2,355		3,701		4,780		7,228
Salaries and benefits	24,090		20,597		47,096		40,647
General and administrative expenses	4,507		3,653		8,540		6,798
Interest and financing costs	348		696		730		1,482
Total expenses	31,300		28,647		61,146		56,155
TOTAL COSTS AND EXPENSES (1)	251,002	[1]	219,930	[1]	456,263	[1]	401,111	[1]
EARNINGS BEFORE PROVISION FOR INCOME TAXES	11,848		13,087		18,131		20,923
PROVISION FOR INCOME TAXES	4,784		5,178		7,364		8,301
NET EARNINGS	$ 7,064		$ 7,909		$ 10,767		$ 12,622
NET EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 0.87		$ 0.97		$ 1.31		$ 1.55
NET EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	$ 0.85		$ 0.94		$ 1.28		$ 1.51
WEIGHTED AVERAGE SHARES OUTSTANDING-BASIC	8,153,495		8,131,088		8,230,022		8,127,228
WEIGHTED AVERAGE SHARES OUTSTANDING-DILUTED	8,327,748		8,384,154		8,422,099		8,348,346

[1] Includes amounts to related parties of $188 thousand and $482 thousand for the three and six months ended September 30, 2010, respectively.