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Note 15 - Foreign Revenues and Operations (Details Textual) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Assets $ 21,779,000 $ 22,704,000
INDIA    
Assets, Noncurrent 176,000 183,000
Foreign [Member]    
Assets 589,000 648,000
Liabilities $ 675,000 $ 526,000