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Note 4 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%  
Income Tax Expense (Benefit), Total $ 1,582 $ 1,538
Deferred Tax Liabilities, Net, Total 78,400  
Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] | State and Local Jurisdiction [Member]    
Deferred Tax Assets, Valuation Allowance, Total 100  
Interest and Penalties Recognized for Uncertain Tax Positions [Member]    
Income Tax Expense (Benefit), Total $ 100