Note 2 - Notes Payable - Senior Loan Agreement (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Senior Notes [Member]
Senior note payable, current	$ 4,000
Senior note payable, long-term	79,000
Senior note payable, face amount	83,000
Debt issuance cost	(1,071)
Senior notes payable, net of debt issuance cost	2,929
Long-term notes payable less current maturities (net)	75,908
Senior notes payable, net of debt issuance cost	78,837
Senior notes payable, net of debt issuance cost	2,929	2,203
Long-term notes payable less current maturities (net)	$ 90,609	$ 97,052