Note 9 - Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Balance beginning of period	$ (6,612,000)	$ (2,730,000)	$ (5,212,000)	$ (2,929,000)
Other comprehensive loss before reclassifications	(154,000)	(966,000)	(1,554,000)	(767,000)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net current-period other comprehensive loss	(154,000)	(966,000)	(1,554,000)	(767,000)
Balance at end of period	$ (6,766,000)	$ (3,696,000)	$ (6,766,000)	$ (3,696,000)