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13. Unaudited Quarterly Financial Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 2,646,000 $ 2,513,000 $ 2,466,000 $ 2,213,000 $ 2,095,000 $ 2,022,000 $ 1,940,000 $ 1,779,000 $ 9,838,408 $ 7,836,485 $ 7,729,286
Operating income 794,000 761,000 739,000 649,000 679,000 856,000 881,000 662,000 2,943,732 3,077,353 2,940,977
Loss on restaurant discontinued         0 0 0 37,000 0 36,776 191,390
Valuation allowance for receivables - including Heyser case (90,000) (350,000) 0 0 (353,000) 0 (751,000) 0 440,000 1,103,521 1,230,000
Change in fair value of derivatives 458,000 (930,000) 315,000 (18,000) (44,000) 0 0 0 (174,737) (44,464) 0
Net income (loss) before income taxes from continuing operations 909,000 (1,120,000) 755,000 311,000 (42,000) 702,000 47,000 570,000 854,968 1,276,907 1,333,173
Net income (loss) from continuing operations (3,017,000) (1,047,000) 581,000 193,000 (26,000) 434,000 31,000 350,000 (3,291,491) 789,027 820,502
Loss from discontinued operations 36,000 (129,000) 0 0 (234,000) (1,426,000) 0 0 (93,436) (1,659,867) (34,724)
Net income (loss) $ (2,981,000) $ (1,177,000) $ 581,000 $ 193,000 $ (260,000) $ (993,000) $ 31,000 $ 350,000 $ (3,384,927) $ (870,840) $ 785,778
Basic $ (.14) $ (.05) $ 0.03 $ 0.01 $ 0.00 $ 0.02 $ 0.00 $ 0.02 $ (.16) $ 0.04 $ 0.04
Diluted (.14) [1] (.05) [1] 0.02 [1] 0.01 [1] 0.00 0.02 0.00 0.02 (.16) [2] 0.04 [2] 0.04 [2]
Net income (loss) per common share                      
Basic (.14) (.06) 0.03 0.01 (0.01) (0.05) 0.00 0.02 $ (.16) $ (.04) $ 0.04
Diluted $ (.14) [1] $ (.06) [1] $ 0.02 [1] $ 0.01 [1] $ (0.01) $ (0.05) $ 0.00 $ 0.02      
[1] Net loss per share is shown the same as basic loss per share because the underlying dilutive securities have an anti-dilutive effect.
[2] In 2017, net loss per share is shown the same as basic loss per share because the underlying dilutive securities have an anti-dilutive effect.