Note 7 - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Expected federal income taxes	$ 9,576	$ 9,832	$ 8,571
Foreign tax rate differential	(139)	(239)	(226)
State income taxes, net of federal benefit and state tax credits	391	332	605
Federal tax credits	(150)	(150)	(217)
Uncertain tax positions	93	182	(43)
Deferred tax adjustment due to change in state tax law	39	58
Recapitalization expenses			182
Release of valuation allowance		1,124	14
Expiration of capital loss carryforward		(1,124)
Other	(60)	(79)	118
Total	$ 9,750	$ 9,936	$ 9,004