Note 11 - Income Taxes (Detail) - Deferred income tax assets (liabilities) consisted of the following (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current deferred income taxes:
Foreign tax credits	$ 67,000	$ 92,000
Temporary differences:
Inventory reserve	121,000	103,000
Intangible assets		3,000
State income taxes	(13,000)	(10,000)
Accrued expenses and inventory	379,000	368,000
Current deferred income tax assets, net	554,000	556,000
Temporary differences:
Property and equipment	(760,000)	(778,000)
Other	(14,000)
State income taxes	(39,000)	(29,000)
Non-current deferred tax liabilities	(813,000)	(807,000)
Net deferred income tax liability	$ (259,000)	$ (251,000)