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Note 15 - Fair Value of Financial Instruments | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Fair Value, Measurement Inputs, Disclosure [Text Block] | ( 15 ) Fair Value of Financial Instruments Cash, accounts receivable, accounts payable and accrued liabilities are reflected in the consolidated financial statements at their carrying amount which approximates fair value because of the short-term maturity of those instruments. The carrying amount of debt outstanding at December 31, 2017 approximates fair value, and is based upon a market approach (Level 2 ).

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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