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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Allowance for doubtful accounts $ 200 $ 321,000
Unamortized loan costs 9,240,000 9,650,000
Unamortized loan costs $ 9,240,000 $ 9,650,000
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000 100,000
Preferred Stock, Shares Issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common Stock, Shares, Issued (in shares) 16,063,228 16,063,228
Common stock, shares outstanding (in shares) 16,063,228 16,063,228
Common Stock, Shares, Issued (in shares) 16,063,228 16,063,228
Series A Cumulative Non-Voting Preferred Stock [Member]    
Preferred stock, shares authorized (in shares) 140 140
Preferred stock, dividend rate, percentage 12.50% 12.50%