CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net earnings	$ 5,500,000	$ 6,889,000	$ 8,426,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	4,353,000	3,285,000	3,566,000
Amortization of credit facility fees	61,000	63,000	65,000
Stock-based compensation	294,000	302,000	364,000
Deferred income taxes	413,000	(966,000)	(4,286,000)
Provision for contingent obligation	1,005,000	424,000	158,000
(Gains) losses on equity investments	(162,000)	90,000
Gain on sale of land	(4,325,000)	(2,413,000)
Changes in assets and liabilities:
Accounts receivable	31,000	(200,000)	(57,000)
Inventories	3,000	(6,000)	2,000
Prepaid expenses and other	(181,000)	37,000	(97,000)
Accounts payable	(8,000)	66,000	(252,000)
Accrued liabilities	407,000	38,000	(3,000)
Payable to/receivable from Dover Downs Gaming & Entertainment, Inc.	(9,000)	2,000
Income taxes payable/receivable	(380,000)	1,284,000	(699,000)
Contract liabilities	(164,000)	(109,000)	(106,000)
Liability for pension benefits	(63,000)	(1,835,000)	(1,248,000)
Net cash provided by operating activities	6,775,000	6,951,000	5,833,000
Investing activities:
Capital expenditures	(6,446,000)	(992,000)	(1,877,000)
Proceeds from sale of land, net	7,224,000	4,945,000
Non-refundable deposit received	500,000
Purchases of equity investments	(51,000)	(124,000)	(176,000)
Proceeds from sale of equity investments	40,000	90,000	145,000
Net cash provided by (used in) investing activities	1,267,000	3,919,000	(1,908,000)
Financing activities:
Borrowings from revolving line of credit	4,180,000	12,260,000	25,680,000
Repayments on revolving line of credit	(4,180,000)	(15,500,000)	(26,280,000)
Dividends paid	(3,642,000)	(2,930,000)	(2,944,000)
Repurchase of common stock	(739,000)	(750,000)	(381,000)
Credit facility fees	(35,000)
Net cash used in financing activities	(4,416,000)	(6,920,000)	(3,925,000)
Net increase in cash	3,626,000	3,950,000
Cash, beginning of year	3,951,000	1,000	1,000
Cash, end of year	7,577,000	3,951,000	1,000
Supplemental information:
Interest (received) paid	(72,000)	72,000	368,000
Income tax payments	1,752,000	1,861,000	3,097,000
Change in accounts payable for capital expenditures	$ (60,000)	$ 60,000	$ (34,000)