Note 3 - Partners' Equity (Details Textual) - $ / shares	1 Months Ended			12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2021	Apr. 30, 2022
Maximum percentage of units to be repurchased	10.00%
Percentage of Adjusted Book Value of Company Allocable to the Repurchase Right Per Unit	66.00%
Minimum Percentage of Outstanding Units Tendered to Use Prorated Method for Calculating Actual Number of Units Acquired	10.00%
Net Repurchase Price of Partner Unit (in dollars per share)	$ 2.51	$ 0.36	$ 0.86	$ 2.51
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share)					$ 0.50
Partners' Capital Account, Units, Treasury Units Purchased (in shares)	121,354	137,455	81,039
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	30,000	30,000	30,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	30,000	30,000	30,000
Limited Partners' Capital Account, Units Outstanding (in shares)	5,243,119			5,334,473
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	0	0