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Sale and Leaseback Transaction (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2006
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2006
Oct. 24, 2006
Sale and Leaseback Transaction          
Purchase price         $ 6,200,000
Realized gain on sale $ 1,051,000 $ 38,000 $ 38,000 $ 300,000  
Unrecognized gain on sale   $ 219,000 $ 257,000    
Recognized remaining term, description   The remaining $751,000 is being recognized ratably over the remaining term of the twenty - year lease at approximately $38,000 per year.      
Purchaser for the property, description   Simultaneous with the closing of the sale of the Bay Shore Property, the Company entered into a 20-year triple- net lease (the "Lease") with the purchaser for the property. Base annual rent is approximately $540,000 for the first five years, $560,000 for the sixth year, and thereafter increases 3% per year. The Lease grants the Company an option to renew the Lease for an additional period of five years. The Company has on deposit with the purchaser of $89,000 as security for the performance of its obligations under the Lease. In addition, at December 31, 2019, the Company had on deposit $150,000 with the landlord as security for the completion of certain repairs and upgrades to the Bay Shore Property.