Note Q - Employee Benefit Plan (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Retirement Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 133,000	$ 212,000
Profit Sharing Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	$ 0
Defined Contribution Plan, Requisite Service Period	3 years

Minimum period employees are required to perform services to become eligible under the defined contribution plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	kmph_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix:	kmph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration