Note 8 - Subsequent Events (Details Textual) - Dividend Reinvestment and Stock Purchase Plan (DSPP) [Member] - USD ($) |
1 Months Ended | 3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|---|
Aug. 06, 2026 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Proceeds from Issuance or Sale of Equity | $ 1,115,000 | $ 3,385,000 | $ 7,740,000 | $ 11,394,000 | $ 13,780,000 |
| Subscriptions Receivable from Shareholders or Affiliates for Issuance of Capital Stock | 237,000 | $ 208,000 | $ 179,000 | ||
| Subsequent Event [Member] | |||||
| Proceeds from Issuance or Sale of Equity | 1,115,000 | ||||
| Subscriptions Receivable from Shareholders or Affiliates for Issuance of Capital Stock | $ 237,000 | ||||