Note 11 - Purchase of Interests in Subsidiaries (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 09, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ (767,000)
Revenue from Contract with Customer, Including Assessed Tax		$ 58,388,000	$ 48,752,000	172,191,000	131,361,000
Net Income (Loss) Attributable to Parent, Total		$ 621,000	$ 246,000	(1,018,000)	$ 346,000
Resource Plus, Inc [Member]
Revenue from Contract with Customer, Including Assessed Tax				19,900,000
Net Income (Loss) Attributable to Parent, Total				$ 1,700,000
Resource Plus, Inc [Member] | BDA [Member]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	70.00%
Resource Plus, Inc [Member]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%
Business Combination, Consideration Transferred, Total	$ 2,756,000
Business Combination, Consideration Transferred, Liabilities Incurred	2,300,000
Resource Plus, Inc [Member] | Mr. Paulk [Member]
Business Combination, Consideration Transferred, Total	3,000,000
Payments to Acquire Businesses, Net of Cash Acquired, Total	400,000
Business Combination, Consideration Transferred, Liabilities Incurred	2,600,000
Debt Instrument, Periodic Payment, Principal	300,000
Resource Plus, Inc [Member] | Mr. Justus [Member]
Business Combination, Consideration Transferred, Total	150,000
Payments to Acquire Businesses, Net of Cash Acquired, Total	50,000
Business Combination, Consideration Transferred, Liabilities Incurred	100,000
Debt Instrument, Periodic Payment, Principal	33,333
Employment Agreement, Base Salary	$ 200,000
Mobex [Member]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%