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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total Revenue $ 9,833,000 $ 10,728,000 $ 18,958,000 $ 20,225,000
Cost of goods sold 6,857,000 7,851,000 14,391,000 14,031,000
Gross profit 2,976,000 2,877,000 4,567,000 6,194,000
Operating expenses        
General and administrative expenses 1,452,000 1,133,000 2,919,000 2,483,000
Selling expenses 613,000 651,000 1,290,000 1,261,000
Total operating expenses 2,065,000 1,784,000 4,209,000 3,744,000
Operating income (loss) 911,000 1,093,000 358,000 2,450,000
Interest income (expense)        
Interest expense (44,000) (45,000) (90,000) (91,000)
Interest income 9,000 9,000 19,000 19,000
Gain on sale of assets 31,000 4,000 55,000 16,000
Other income 9,000 13,000 18,000 24,000
Total other expense 5,000 (19,000) 2,000 (32,000)
Income before income tax expense 916,000 1,074,000 360,000 2,418,000
Income tax expense (benefit) 225,000 363,000 90,000 849,000
Net income (loss) $ 691,000 $ 711,000 $ 270,000 $ 1,569,000
Basic and diluted earnings per share (in dollars per share) $ 0.14 $ 0.14    
Basic income (loss) per share (in dollars per share)     $ 0.05 $ 0.31
Weighted average number of common shares outstanding:        
Basic (in shares) 5,080,000 5,045,000 5,076,000 5,026,000
Diluted (in shares) 5,104,000 5,095,000 5,101,000 5,065,000
Product sales        
Total Revenue $ 6,943,000 $ 7,611,000 $ 14,396,000 $ 12,559,000
Barrier rentals        
Total Revenue 340,000 302,000 649,000 2,825,000
Royalty income        
Total Revenue 506,000 473,000 727,000 904,000
Shipping and installation revenue        
Total Revenue $ 2,044,000 $ 2,342,000 $ 3,186,000 $ 3,937,000