Note 18 - Acquisition of Businesses - Aggregate Consideration (Details) - USD ($)	Dec. 31, 2018	May 02, 2018	Dec. 31, 2017	Dec. 01, 2017	Mar. 08, 2016	Mar. 01, 2016
Goodwill, Ending Balance	$ 33,961,000		$ 16,032,000
CID Resources [Member]
Cash		$ 1,360,000
Accounts receivable		9,657,000
Prepaid expenses and other current assets		1,248,000
Inventories		30,692,000
Property, plant and equipment		1,134,000
Contract assets		2,535,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		41,020,000
Goodwill, Ending Balance		17,968,000
Total assets		105,614,000
Accounts payable		4,472,000
Deferred tax liability		9,461,000
Other current liabilities		967,000
Total liabilities		$ 14,900,000
BAMKO [Member]
Accounts receivable						$ 4,885,000
Prepaid expenses and other current assets						3,200,000
Inventories						236,000
Property, plant and equipment						199,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total					$ 11,400,000	11,360,000
Goodwill, Ending Balance						6,994,000
Total assets						26,974,000
Accounts payable						1,314
Other current liabilities						736,000
Total liabilities						2,050,000
Other assets						$ 100,000
Tangerine [Member]
Accounts receivable				$ 5,051,000
Prepaid expenses and other current assets				969,000
Property, plant and equipment				131,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				6,495,000
Goodwill, Ending Balance				4,169,000
Total assets				16,815,000
Accounts payable				3,374,000
Other current liabilities				1,353,000
Total liabilities				$ 4,727,000