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Note 13 - Fair Value of Financial Statements
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
13.
Fair Value of Financial Instruments
 
The carrying amounts of cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturity of these instruments. The carrying amount of our long-term debt approximates fair value as its interest rate is based upon prevailing market rates.