Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Accounts Receivable (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 21,856	$ 21,630
Less allowance for doubtful accounts	(122)	(216)
	21,734	21,414
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	18,497	18,011
Unbilled [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	3,269	3,577
Non-trade [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 90	$ 42