Note 3 - Supplemental Balance Sheet Information (in thousands) (Detail) - Accounts receivable (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable, Gross	$ 21,630	$ 15,518
Less allowance for doubtful accounts	216	57
	21,414	15,461
Trade Accounts Receivable [Member]
Accounts Receivable, Gross	18,011	11,806
Unbilled [Member]
Accounts Receivable, Gross	3,577	3,309
Non-trade [Member]
Accounts Receivable, Gross	$ 42	$ 403