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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Intangible Assets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Gross, Total $ 5,000,000  
Less accumulated amortization (1,638,000) $ (2,381,000)
Intangible assets, net 3,332,000 1,634,000
Customer Contracts And Lists [Member]    
Finite-Lived Intangible Assets, Gross, Total 2,680,000 4,015,000
Trade Names [Member]    
Finite-Lived Intangible Assets, Gross, Total 900,000
Patents [Member]    
Finite-Lived Intangible Assets, Gross, Total 870,000
Noncompete Agreements [Member]    
Finite-Lived Intangible Assets, Gross, Total $ 520,000