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Note 1 - Significant Accounting Policies - Major Customers (Details) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
US-based IT OEM Company [Member]    
Concentration risk, percentage 67.00% 39.00%
US-based Technology Company [Member]    
Concentration risk, percentage 4.00% 12.00%
US-based Data Center Services Company [Member]    
Concentration risk, percentage 0.00% 13.00%