Note 4 - Accounts Receivable (Detail) - Accounts receivable (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts and sales discounts	$ (1,489)	$ (1,455)
Accounts receivable, net	39,986	39,031
Billed Revenues [Member]
Accounts receivable, gross, current	27,671	28,460
Unbilled Revenues [Member]
Accounts receivable, gross, current	3,941	3,143
Work In Progress [Member]
Accounts receivable, gross, current	$ 9,863	$ 8,883