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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
shares
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Reportable Segments 2      
Weighted Average Number of Shares Outstanding, Basic, Total | shares 4,748,474 4,711,608    
Weighted Average Number Diluted Shares Outstanding Adjustment, Total | shares 0 0    
Operating Lease, Right-of-Use Asset $ 1,214    
Operating Lease, Liability, Total $ 1,214    
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset     $ 1,280  
Operating Lease, Liability, Total     $ 1,280