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Note 2 - Cash and Cash Equivalents
9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Cash and Cash Equivalents Disclosure [Text Block]
2.
Cash and Cash Equivalents
 
The Company considers all highly liquid investments with original maturities of
90
days or less to be cash equivalents. Cash equivalents consisted exclusively of cash in the bank and bank certificates of deposits.