Note 3 - Partners' Equity (Details Textual) - $ / shares	1 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Apr. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
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)		$ 0.36	$ 0.86	$ 1.50
Partners' Capital Account, Units, Treasury Units Purchased (in shares)		137,455	81,039	86,388
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)		5,334,473				5,334,473	5,334,473
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						0		0
Forecast [Member]
Net Repurchase Price of Partner Unit (in dollars per share)	$ 2.51
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share)					$ 0.50