Note 5 - Income Taxes (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	34.00%
Deferred Tax Assets, Net, Current	$ 547,000	$ 789,000
Deferred Tax Liabilities, Net, Noncurrent	7,527,000	7,588,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	214,000	0	2,000
Capital Loss Carryforwards Expired	76,000
Undistributed Earnings of Foreign Subsidiaries	8,800,000
Potential Income Tax Related To Repatriation Of Foreign Earnings	732,000
Unrecognized Tax Benefits	224,000	266,000	269,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	11,000
Capital Loss Carryforward [Member]
Other Tax Carryforward, Gross Amount	3,100,000
Other Tax Carryforward, Valuation Allowance	$ 1,100,000