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Note 12 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Legal Fees $ 154,000 $ 188,000
Due to Related Parties, Noncurrent 1,507,000 1,416,000
Interest Expense, Related Party 94,000 93,000
Due from Employees 41,000 47,000
Schwan Incorporated [Member]    
Related Party Transaction, Amounts of Transaction 19,000 15,000
CTI Europe [Member]    
Long-term Debt, Gross $ 32,000 $ 27,000