Small business owners showed enthusiasm for current conditions but are worried about the future, according to National Federation of Independent Business' monthly Small Business Optimism index published Tuesday.

The index dipped to 104.5 in April from 104.7 in March, while “expectations for future business conditions plunged by eight points, a sign that business owners were shaken by Congress' failure at the end of March to repeal and replace Obamacare,” according to a release.

Small business owners have not shown this much optimism since 1983, NFIB said.

"Expected business conditions is the most volatile component of the Index," said NFIB Chief Economist Bill Dunkelberg. "Small business owners want Congress and the White House to address the high cost of health care, which has been their top concern for more than 30 years. When that effort failed in March, expectations for better business conditions collapsed."

Last week, the House passed a bill to repeal most of Obamacare.

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