Note 4 - Supplemental Cash Flow Information (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes Paid	$ 29,000	$ 18,000
Interest Paid	$ 99,000	$ 95,000
Company Stock Received in Lieu of Cash Stock Options Exercised		3,432
Stock Issued During Period, Shares, New Issues		9,640