Note 9 - Liabilities (Detail) - Accrued and other liabilities: (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued and other liabilities	$ 10,111	$ 6,103
Tax Related [Member]
Accrued and other liabilities	1,237	1,197
Accrued compensation and related taxes [Member]
Accrued and other liabilities	3,003	3,424
Deferred revenue [Member]
Accrued and other liabilities	2,196	299
Insurance [Member]
Accrued and other liabilities	2,225
Professional services [Member]
Accrued and other liabilities	431	282
Accrued fuel and rig-related charges [Member]
Accrued and other liabilities	204	162
Other accrued expenses [Member]
Accrued and other liabilities	$ 815	$ 739