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Note 13 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Legal Fees $ 88,000 $ 154,000
Due to Related Parties, Noncurrent, Total 1,597,000 1,507,000
Interest Expense, Related Party 93,000 94,000
Due from Employees 28,000 41,000
Schwan Incorporated [Member]    
Related Party Transaction, Amounts of Transaction 41,000 19,000
CTI Europe [Member]    
Long-term Debt, Gross $ 32,000 $ 32,000