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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Jul. 01, 2018
Operating Lease, Right-of-Use Asset $ 7,368,000   $ 0  
Operating Lease, Liability, Total 8,153,000      
Retained Earnings [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption $ 1,442,000     $ 170,000
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset   $ 7,664,000    
Operating Lease, Liability, Total   8,549,000    
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 1,442,000