Note 2 - Revenue - Disaggregation of Revenue (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Percent of revenues	100.00%	100.00%
Transferred over Time [Member]
Percent of revenues	66.00%	63.00%
Transferred at Point in Time [Member]
Percent of revenues	34.00%	37.00%