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Note 2 - Supplemental Balance-sheet Information (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Amortization of Intangible Assets $ 143,000 $ 137,000
Depreciation, Depletion and Amortization, Nonproduction 300,000 $ 400,000
Computer Software, Intangible Asset [Member]    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 18,000  
Customer-Related Intangible Assets [Member]    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 91,000  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 35,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 91,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 91,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 91,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 91,000  
Trade Names [Member]    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Six 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Seven 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Eight 6,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Nine $ 6,000