Note 14 - Employee Benefit Plan (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Partnership's Employee Unit Purchase Plan [Member]
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total (in shares)	1,000,000	1,000,000
Partnership's 401(k) Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.5	$ 0.6
Defined Contribution Plan, Employer Discretionary Profit Sharing Contribution Amount	$ 0.5	$ 0.6