Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 7,000	$ 7,000
Deferred Tax Assets, Capital Loss Carryforwards			$ 1,100,000
Deferred Tax Assets, Net, Current	1,100,000	349,000
Deferred Tax Liabilities, Net, Noncurrent	6,794,000	7,432,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		(1,100,000)	(14,000)
Capital Loss Carryforwards			3,100,000
Deferred Tax Assets, Valuation Allowance			1,100,000
Undistributed Earnings of Foreign Subsidiaries	14,100,000
Potential Income Tax Related to Repatriation of Foreign Earnings	534,000
Unrecognized Tax Benefits	450,000	360,000	$ 188,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	10,000	8,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	244,000	210,000
Unrecognized Tax Benefits that Would Not Impact Effective Tax Rate	$ 206,000	$ 150,000