STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balances at Dec. 31, 2015	$ 116,000	$ 17,810,000	$ 6,805,000	$ (11,000)	$ 24,720,000
Balances, shares at Dec. 31, 2015	11,633,000
Issuance of common stock, net	$ 1,000	45,000			46,000
Issuance of common stock, shares	102,000
Repurchase of common stock, net	$ (1,000)	(311,000)			$ (312,000)
Repurchase of common stock, net, shares	(128,000)				(128,000)
Value of stock-based compensation	$ 1,000	203,000			$ 204,000
Value of stock-based compensation, shares	54,000
Restricted stock award issuance	$ 1,000	(1,000)			0
Restricted stock award issuance, shares	100,000
Tax deficiency from stock-based awards		(41,000)			(41,000)
Cash dividends declared ($0.70 per share)		(2,714,000)	(5,519,000)		(8,233,000)
Net loss			(1,286,000)		(1,286,000)
Other comprehensive income, net of tax				11,000	11,000
Balances at Dec. 31, 2016	$ 118,000	14,991,000	0	0	15,109,000
Balances, shares at Dec. 31, 2016	11,761,000
Repurchase of common stock, net					$ 0
Repurchase of common stock, net, shares					0
Repurchase of common stock upon vesting of restricted stock awards and vesting of restricted stock units		(16,000)			$ (16,000)
Repurchase of common stock upon vesting of restricted stock awards and vesting of restricted stock units, shares	21,000
Value of stock-based compensation	$ 1,000	386,000			387,000
Value of stock-based compensation, shares	72,000
Restricted stock award issuance	$ 0				0
Restricted stock award issuance, shares	60,000
Net loss			(639,000)		(639,000)
Balances at Dec. 31, 2017	$ 119,000	$ 15,361,000	$ (639,000)	$ 0	$ 14,841,000
Balances, shares at Dec. 31, 2017	11,914,000