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Note 9 - Retirement Savings Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00% 100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 4.00% 4.00%
Defined Contribution Plan, Employer Contribution Amount $ 29,952 $ 33,143
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 0 $ 0