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Note 8 - Leases (Details Textual)
 1 Months Ended
Nov. 30, 2003
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Operating Lease, Weighted Average Remaining Lease Term (Year)   3 years 255 days  
Operating Lease, Liability, Total   $ 1,726,000 $ 1,728,000
Operating Lease, Right-of-Use Asset   $ 1,726,000 $ 1,728,000
Operating Lease, Weighted Average Discount Rate, Percent   4.70%  
Lessee, Finance Lease, Term of Contract (Year) 10 years    
Number of Consecutive Renewal Term Options 4    
Lessee, Finance Lease, Renewal Term (Year) 10 years    
Lessee, Finance Lease, Annual Rent   $ 15,000  
Leasehold Improvements Required to be Made Per Year   $ 150,000  
Lessee, Finance Lease, Remaining Lease Term (Year)   32 years 219 days  
Finance Lease, Weighted Average Remaining Lease Term (Year)   2 years 292 days  
Finance Lease, Weighted Average Discount Rate, Percent   4.70% 4.50%
Lease for Golf Cart GPS Equipment [Member]      
Operating Lease, Liability, Total   $ 37,000  
Operating Lease, Right-of-Use Asset   $ 37,000  
Minimum [Member]      
Lessee, Operating Lease, Remaining Lease Term (Year)   1 year  
Minimum [Member] | Golf and Related Operations [Member]      
Lessee, Finance Lease, Remaining Lease Term (Year)   1 year  
Maximum [Member]      
Lessee, Operating Lease, Remaining Lease Term (Year)   5 years  
Maximum [Member] | Golf and Related Operations [Member]      
Lessee, Finance Lease, Remaining Lease Term (Year)   4 years 109 days