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Note 10 - Credit Quality of Rents Receivable - Allowance for Doubtful Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Beginning balance $ 13,000 $ 34,000
Accounts receivable (written off) (13,000) (21,000)
Ending Balance $ 13,000