CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net earnings	$ 7,482,000	$ 5,500,000	$ 6,889,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	3,046,000	4,353,000	3,285,000
Amortization of credit facility fees	56,000	61,000	63,000
Stock-based compensation	311,000	294,000	302,000
Deferred income taxes	(2,552,000)	413,000	(966,000)
(Benefit) provision for contingent obligation	(171,000)	1,005,000	424,000
(Gains) losses on equity investments	(115,000)	(162,000)	90,000
Gain on sale of land	(4,843,000)	(4,325,000)	(2,413,000)
Changes in assets and liabilities:
Accounts receivable	44,000	31,000	(200,000)
Inventories		3,000	(6,000)
Prepaid expenses and other	(398,000)	(181,000)	37,000
Accounts payable	219,000	(8,000)	66,000
Accrued liabilities	(383,000)	407,000	38,000
Payable to Dover Downs Gaming & Entertainment, Inc		(9,000)	2,000
Income taxes payable/receivable	215,000	(380,000)	1,284,000
Contract liabilities	419,000	(164,000)	(109,000)
Liability for pension benefits	(137,000)	(63,000)	(1,835,000)
Net cash provided by operating activities	3,193,000	6,775,000	6,951,000
Investing activities:
Capital expenditures	(1,998,000)	(6,446,000)	(992,000)
Proceeds from sale of land, net	5,960,000	7,224,000	4,945,000
Non-refundable deposit received	500,000	500,000
Purchases of equity investments	(361,000)	(51,000)	(124,000)
Proceeds from sale of equity investments	337,000	40,000	90,000
Net cash provided by investing activities	4,438,000	1,267,000	3,919,000
Financing activities:
Borrowings from revolving line of credit	3,880,000	4,180,000	12,260,000
Repayments on revolving line of credit	(3,880,000)	(4,180,000)	(15,500,000)
Dividends paid	(2,546,000)	(3,642,000)	(2,930,000)
Repurchase of common stock	(94,000)	(739,000)	(750,000)
Credit facility fees		(35,000)
Net cash used in financing activities	(2,640,000)	(4,416,000)	(6,920,000)
Net increase in cash	4,991,000	3,626,000	3,950,000
Cash, beginning of year	7,577,000	3,951,000	1,000
Cash, end of year	12,568,000	7,577,000	3,951,000
Supplemental information:
Interest (received) paid	(17,000)	(72,000)	72,000
Income tax payments	2,275,000	1,752,000	1,861,000
Change in accounts payable for capital expenditures	$ 232,000	$ (60,000)	$ 60,000