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Note 2 - Recent Accounting Pronouncements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Corporate income tax     21.00% 34.00% 35.00%  
Effective tax rates 16.70% 26.20% 16.30% 27.30%    
ASU 2016-01 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
New accounting pronouncement or change in accounting principle on reclassification net loss from accumulated other comprehensive loss to retained earnings           $ 254,000
ASU 2018-02 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Reclassification from accumulated other comprehensive loss to retained earnings     $ 805,000