Note 9. Credit Facilities and Capital Leases (Detail) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Oct. 31, 2009
Long-term Line of Credit			$ 60,000,000
Debt Instrument, Interest Rate Terms	The interest rate on outstanding loans under the agreement is between 2.75% and 3.5% above the LIBOR or an alternative base rate plus an applicable margin of between 1.75% and 2.5%.
Debt Instrument, Fee	We are required to pay a standby fee of between 0.825% and 1.05% per annum on undrawn amounts under the revolving credit agreement.
Amortization of Deferred Charges	300,000
Interest Expense, Debt	200,000
Capital Lease Obligations	7,500,000	6,300,000
Capital Lease Obligations, Current	3,045,000	2,481,000
Capital Lease Obligations, Noncurrent	4,473,000	3,792,000
Capital Leases, Future Minimum Payments Due		8,100,000
Capital Leases, Future Minimum Payments, Interest Included in Payments		$ 600,000