Note 1 - Basis of Presentation	3 Months Ended
Mar. 31, 2016
Disclosure Text Block [Abstract]
Business Description and Basis of Presentation [Text Block]	Note 1: Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Rule 8-03 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting only of normal recurring accruals) considered necessary for a fair presentation have been included. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in Guaranty Federal Bancshares, Inc.’s (the “Company”) Annual Report on Form 10-K for the year ended December 31, 2015 (“2015 Annual Report”) filed with the Securities and Exchange Commission (the “SEC”). The results of operations for the periods are not necessarily indicative of the results to be expected for the full year. The condensed consolidated balance sheet of the Company as of December 31, 2015, has been derived from the audited consolidated balance sheet of the Company as of that date. Certain information and note disclosures normally included in the Company’s annual financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted.

Note 1 - Basis of Presentation

3 Months Ended

Mar. 31, 2016

Business Description and Basis of Presentation [Text Block]

Note 1: Basis of Presentation

The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Rule 8-03 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting only of normal recurring accruals) considered necessary for a fair presentation have been included.

These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in Guaranty Federal Bancshares, Inc.’s (the “Company”) Annual Report on Form 10-K for the year ended December 31, 2015 (“2015 Annual Report”) filed with the Securities and Exchange Commission (the “SEC”). The results of operations for the periods are not necessarily indicative of the results to be expected for the full year. The condensed consolidated balance sheet of the Company as of December 31, 2015, has been derived from the audited consolidated balance sheet of the Company as of that date. Certain information and note disclosures normally included in the Company’s annual financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted.