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Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent             35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       $ 1,400,000      
Gain on Adjusting Carrying Value of Equity Securities with No Readily Determinable Fair Value   $ 209,000    
Accounting Standards Update 2016-01 [Member]              
Gain on Adjusting Carrying Value of Equity Securities with No Readily Determinable Fair Value $ 209,000            
Equity Securities without Readily Determinable Fair Value, Amount $ 662,000            
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]              
Tax Cuts and Jobs Act of 2017 Reclassification From Aoci to Retained Earnings             $ 94,000
Scenario, Forecast [Member]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent           21.00%  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]              
Number of Major Customers   0   0