Changes in Shareholders' Equity - Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Beginning Balance			$ 80,618
Issuance of 1,905 common shares for stock options exercised, employee stock purchases, and other			30
Share based compensation – options granted			93
Dividends paid:
Preferred stock, $5.00 per share			(3)
Common stock, $.04 per share			(392)
Net loss	$ 185	$ 773	(814)	$ (70)
Ending Balance	79,532		79,532
Preferred Stock [Member]
Beginning Balance			32
Dividends paid:
Ending Balance	32		32
Common Stock [Member]
Beginning Balance			2,432
Issuance of 1,905 common shares for stock options exercised, employee stock purchases, and other			1
Dividends paid:
Ending Balance	2,433		2,433
Additional Paid-in Capital [Member]
Beginning Balance			38,050
Issuance of 1,905 common shares for stock options exercised, employee stock purchases, and other			29
Share based compensation – options granted			93
Dividends paid:
Ending Balance	38,172		38,172
Retained Earnings [Member]
Beginning Balance			40,104
Dividends paid:
Preferred stock, $5.00 per share			(3)
Common stock, $.04 per share			(392)
Net loss			(814)
Ending Balance	$ 38,895		$ 38,895