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, 2014	$ 122,000	$ 19,177,000	$ 5,271,000	$ (11,000)	$ 24,559,000
Balances, shares at Dec. 31, 2014	12,191,000
Issuance of common stock, net	$ 1,000	47,000			48,000
Issuance of common stock, shares	69,000
Repurchase of common stock, net	$ (7,000)	(1,755,000)			(1,762,000)
Repurchase of common stock, shares	(664,000)
Value of stock-based compensation		353,000			353,000
Value of stock-based compensation, shares	37,000
Tax deficiency from stock-based awards		(12,000)			(12,000)
Net income (loss)			1,534,000		1,534,000
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, shares	(128,000)
Value of stock-based compensation	$ 1,000	203,000			204,000
Value of stock-based compensation, shares	54,000
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 income (loss)			(1,286,000)		(1,286,000)
Other comprehensive income, net of tax				11,000	11,000
Balances at Dec. 31, 2016	$ 117,000	$ 14,992,000	$ 0	$ 0	$ 15,109,000
Balances, shares at Dec. 31, 2016	11,661,000