Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Leases (Details Textual)

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Note 6 - Leases (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Lessee, Operating Lease, Term of Contract 10 years    
Operating Lease, Right-of-Use Asset     $ 15,300,000
Operating Lease, Liability, Total $ 14,679,000    
Operating Lease, Weighted Average Remaining Lease Term 6 years 73 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.00%    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 400,000    
Operating Lease, Payments 800,000    
Operating Lease, Cost 900,000    
Variable Lease, Cost 100,000    
Short-term Lease, Cost 7,000    
Operating Leases, Rent Expense, Total   $ 700,000  
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset     15,300,000
Operating Lease, Liability, Total     $ 15,300,000
Accounting Standards Update 2016-02 [Member] | Other Assets [Member]      
Operating Lease, Right-of-Use Asset 14,700,000    
Accounting Standards Update 2016-02 [Member] | Other Liabilities [Member]      
Operating Lease, Liability, Total $ 14,700,000