Note 3 - Related Party Transactions - Expiration Dates of Contingent Future Liability (Details) - Investment Management Agreement [Member] $ in Thousands	Mar. 31, 2026 USD ($)
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	$ 28,178
June 30, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	3,120
September 30, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	3,471
December 31, 2026 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	3,002
March 31, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,285
June 30, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,582
September 30, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,368
December 31, 2027 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,085
March 31, 2028 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,144
June 30, 2028 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,290
September 30, 2028 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	2,799
December 31, 2028 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	1,650
March 31, 2029 Expiration [Member]
Incentive Fee Cap and Deferral Mechanism, Contingent Future Liability	$ 382